For me, I was introduced to it by the youtuber Dollightful! I really loved her doll customization videos, especially the ones centered around decora kei!
I liked J-music (J-rock mainly) super casually for years but within the last 5 or so years I started seeing Harajuku fashion online and ever since I've been buying some clothes and trying different styles myself
i discovered visual kei with the band vanan'ice and got immediatly hooked ! they were so cool, but compared to my current taste it's extremely different ( ̄y▽ ̄)╭ Ohohoho.....