Ötzi received 61 separate tattoos in the Italian Alps 5000 years ago. 2000 years ago, tattoos were known to the Romans as a Pictish practice. 1000 years ago, ibn Fadlan noticed tattoos on some of the Varangian merchants he encountered along the Volga. Yet when Europeans encountered tattooed Polynesians in the 17th century, this practice seems to have been quite foreign to them.
How and why did tattooing disappear between the 11th and 17th centuries? Do we know attitudes toward tattooing might have been held by the church?
Here u/platypuskeeper talks about the lack of evidence for tattooing practices among Scandinavians and the ambiguity of Ibn Fadlan's report. While that still leaves your question about the Picts and Ötzi, I thought the post would be an interesting read on an adjacent topic while you wait for an answer.