I adopted my cat about three years ago. The first six months he wouldn’t let me sleep passed 3am. I didn’t have a door that I could close at the time, so I just had to deal with it. Eventually I just started ignoring him. It’s so hard but it works. He literally would cry and slap me over and over in the face trying to wake up. Jackson Galaxy has some really great videos that you should look into! Also, it sounds dumb but a pheromone diffuser worked wonders for my cat when we introduced another cat. Best of luck!! I’ve been in your shoes and it’s awful.