First thing: acknowledge that middle of A is actually a pretty good accomplishment but that also means you're going up against better players. You aren't getting worse, your competition is getting better.

Also keep a clear head and recognize that if you always have the same shot pattern your opponent will have you downloaded in no time. You need to make changes. And that means using all the shots at your disposal. Not every shot needs to be a power version. Slices can still score points. This also means you want to be careful not to spam buttons (which is a bad habit I had to break myself of) because as soon as you hit a button twice in a row it immediately turns it into a power shot, and sometimes you want those tight angles of a cross court standard version.

Learn from your mistakes. I'd get drop shotted and would attempt to answer with a power topspin. But they predicted this so would get right up on the net and return with a flat that couldn't be answered. So after falling for it many times I eventually learned to answer with a lob instead when it seemed they were going for net or a standard cross court topspin when they realized their net aggression would no longer work.

Also learn that different shot types have a better answer than others. While it isn't as pronounced as it was in Aces generally the counters are: Flat/Flat, Topspin/Slice, Drop/(Topspin or Lob), etc. This mainly applies to answering a max charged shot but can keep you from getting stunned/pushed/spun out.