Unfortunately, since you posted this either on an alt-account or deleted all your previous questions, I can't give you feedback specifically tailored to what you have asked in the past.

What we as mods recommend to users is a variety of things and it all starts with the questions you ask.

In the past we did a Rules Roundtable on asking better questions or as /u/Georgy_K_Zhukov put it on "Making Not Dumb Questions More Not Dumber". Question format can have a huge impact both on upvotes and on people, flairs and non-flairs alike, feeling able to/wanting to answer a question. I have written in the past about Hitler questions and a question phrased as "What did Hitler think about the ladies?" is to me as someone who answers a lot of these questions immediately off-putting while "What was the Nazis' policies and ideology towards marriage and sex?" is a question I find interesting and want to answer.

If you have trouble formulating your question, we as a mod team are also very much willing to help. Shoot us a ModMail about the question you have and we will help you find the best way to phrase it (also, most likely upvote it, once it is posted).

You can also always use our list of flaired users and their profiles to find someone and contact them within the area of your interest. While we do discourage just tagging people, most flaired users appreciate pms about questions in their fields because sometimes people don't see relevant questions posted or posted right away.

You can also resubmit questions more than once. We ask that people wait for 24 hours before reposting a question but once that day has passed, re-submit away (sometimes, mentioning in the title that you are resubmitting for the second or third time also helps a question to garner more visibility). As we found, visibility is the key to getting an answer to a question. More visibility means a higher likelihood that your question will be answered.

At the same time, it is the unfortunate reality of this sub that there are questions that cannot be answered. This can have two reasons: A.) There isn't any research or sources with which the question can be answered or B.) the likelihood of someone with the expertise to answer this question being on reddit or being on our sub is very, very small.

With A.), this is related to the guide above but in general, there are things which cannot be answered for want and lack of sources and research. These are often questions that ask about the minute details of the lives of people that have left little to no trace in the historical record. "What did the average levy think about his role in the First Crusade?" might at best garner you a very general response about social and political attitudes towards said crusade but as such is pretty much unanswerable since we cannot say what the average levy thought for he didn't leave us anything to go by.

As for B.) both reddit and by extension our sub caters to a demographic that is overwhelmingly white, male, from the US and is interested and invested in certain topics such as military history, European history, or the history of science. This is both reflected in the majority of questions asked as well as in the majority of answers provided. Certain fields, while studied in academic settings in the US and Europe are just majorly underrepresented on this site and by extension on this sub. Take e.g. the fact that we have a very small number of experts on Africa, an even smaller number of experts on the history of Oceania and – by the latest count – all but one person doing history of India.

We as a team have previously and continue to work hard to rectify this, including recruitment among people we know and people we don't know in academia, but attracting people to this format and onto a site like reddit (given its reputation among a general public) is really, really difficult. Which leaves us with the unfortunate reality that attracting people from certain fields is hard and these fields remain under-served in terms of expertise here.

So this is about the gist of it: Getting an answer can depend on the format and phrasing of your question, on getting help from us and the expert flairs and the actual content, for some of which, it is much harder to find people knowledgeable enough to answer questions.

/u/creesch is right, it would be good to see examples of your questions. AskHistorians sadly doesn't have an expert on everything (even though there are people who come close), so you might be hitting one of those blindspots.

To actually answer what you're asking in general - repost the questions. Sometimes the person equipped with the right knowledge does not have the time or misses your post entirely. I try to find popular and interesting questions without answers and post them into the Sunday Digest thread, but you can always do that yourself with your own questions. A little bit of whining sometimes helps too, so you might write something akin to "Asking for the third time, how did..." and have a slightly better chance of getting an answer. All that being said, because I do scroll through the whole week to find the unanswered good questions, I never stop being amazed at just how hard that is.

It would probably help if you had examples of the questions you never got an answer to.

It could simply be that the framing of the questions makes it difficult to answer.

Answering questions in a good way is difficult, answering questions that are unclear can be downright impossible.

Asking questions in a way they get a meaningful answer (or an answer at all) is also something that takes more effort and thought than you might realize.

It could also be possible that there is no one here on AskHistorians that could give a comprehensible and in depth answer on the subject or subjects? The questions may attract public interest yes, but in my opinion it is better that they remain unanswered, than if they get a half-assed or not well researched answers.