It's just when I play one of those above players I always win in tie-break or 7-5 or 6-4 (excluding losses). It's really hard to break them. On top of their awesome 1st serve, everyone has been spamming top spin to the backhand lately which is more troublesome for me to return.
If I step back too much then it's really hard to come forward to the baseline or even to the net if opponent executed drop shot. So that's one problem. And then there is a spin. Usually the ball changes trajectory after it has bounced so I really have no choice but to return safeshot (if I could do that) or ace to my hole.
I know that there is a little autopos trick where you hit the button sometimes before the ball hits the racket or something. Needless to say, I don't actually get it (how it works). Can someone explain it to me like I'm 5 years old

P.S. "Every little helps"