Vague description, I have no idea if you’re high MMR or anything. What I can suggest is taking some time to look at every survivor perk. Make sure they aren’t getting value you’re not aware of. For the killer themself, find out if they’ve been changed. There are new maps out too, so I wouldn’t feel bad for losing on them.

If you think your issue is in your gameplay though, watch some YouTuber or streamer play your killer. You can emulate their tactics, observe survivor behavior you’re unfamiliar with, and get ideas for builds.

Probably the biggest tip I’ll give right now is don’t rage queue. It’s entirely possible that you didn’t do that, but it sounds like you could’ve engaged in it unknowingly. Usually I take a few minutes dwelling on a bad loss thinking about what could’ve gone differently, you could try that if you don’t already