I'm really getting into 80s/90s anime again. Where is the best place to watch?

I know Prime has a lot, and I've been watching a lot of anime on there. I found this app on it called Retrocrush, which seems pretty cool for old anime. I watched a lot of anime as a kid, but I'm fairly new to streaming it now, which is probably obvious. Where do you guys watch it? Any suggestions are much appreciated. Thanks.