Is there a way to hide read posts across all instances I'm signed into so when I switch to an account in another instance I don't see the same things?

I can post this because I'm still signed in on jerboa but I can't log in on my browser or reset my password.

My password is only 8 characters and I can't even click login without typing 10 characters and when I go to forgot password and click reset password I never get an email to reset it.

I'm having the same problem on another instance but I can't even use jerboa with that one.

I had the same problem on lemmy.world but password reset worked there.

Any advice?