Have you checked out ATF? Chan.sankakucomplex is a pretty great place to find material as well.

Exhentai is pretty great as well, but you need an ehentai account to get in. Also lah.li

I’m surprised no one’s mentioned Baraag/Pawoo yet. They’re Mastodon instances that allow loli/shota, and Pawoo is managed by the same people who made Pixiv. I get most of my lolisho content from Baraag as you can see that in most of my posts I just link directly to their images.

I don’t really have a list of loli artists to check out, so I’d recommend just going through the loli hashtag or to have a look at the list of people I’m following to see if you find anything you like.