I want to express that I understand your feelings to a high degree. I first read the comic in 2024 and immediately read the epilogues and BC, and it messed me up emotionally for a few months. While you can’t unread them, the only advice I can give is to read homestuck again so that it’s more entrenched in your mind. I understand not being able to ignore the continuations, but in truth disregarding them as much as possible helped me forget about them to the most part. basically, find joy in the arcs and relationships built in the comic and try to think of act 7 as the real end. it’s impossible to fully forget, but by thinking and talking about HS by itself you can start to move past it. that said, I have only been in the fandom for a relatively short time so I understand if this doesn’t help and I wish you luck in rejoining the fandom.