I highly recommend this site for that. https://kanji.koohii.com/ which goes along with the book "Remembering the Kanji" by James Heisig (strictly speaking, you don't need the book, but I think it will help understand the idea behind the process). But the stories (mnemonics) on the website are better than the ones in the book, but also let you put in your own stories. You can also vote and choose existing stories, so there are crowd sourced mnemonics that other people have said work for them. One interesting side effect of that is a lot of people decided to use Spider Man whenever there is a "thread" radical, for more memorable stories. I did it around 15 years ago and learned how to write all the 2000+ commonly used kanji in a few months (9 months for me; 2-3 months for a more diligent person). It uses a spaced repetition system (Lietner box method).