This has been asked a number of times and has its own section in the FAQ. You might be interested in the following posts:

• The order of the alphabet

• Where did the origin of the English language alphabet come from? More specifically, why is there 26 letters? Why are there not more?

• Why is the English Alphabet in the order that it is?

• Who decided that the Alphabet should go in the order it is and why?

• How did the letters of the alphabet end up in that order?

• How did the "alphabetical order" of Latin script (the "English alphabet") come to be?

• Have alphabets always had specific orders/sequences? Is there a reason they're ordered in such a way?

However I also strongly recommend taking a look at this answer by u/intangible-tangerine which handles it much more comprehensively.

Of course other people are welcome to comment as well.