Library Genesis is great, but it doesn't have much in terms of journal articles. sci-hub did but the attacks on them in Indian courts have made it so they haven't been able to upload new articles since Dec 2020. They only have pre-2020 articles. Anna's archive is basically just a combo of those two sources and some others things.

I really, really miss sci-hub and being able to read research papers. Before sci-hub there were a handful of forums for requesting and fulfilling full text papers. But those forums basically died because sci-hub was so easy and useful. And now that sci-hub is dead there's nothing.