Your brain will try to help you hit your target, and you can be as general or specific as you want. Here is an example we use all the time - “Aim small, miss small” means to have as tiny a target as your skill allows.
Positive intention will help with all of your shots. Before serving try this. Walk yourself through HOW your serving it going to go and WHERE it’s going to go like this - “the serve goes over the net by one to three feet, and lands near the baseline and toward my opponent’s backhand.” Your brain has been told the instructions and now you body is ready to execute. Give it a shot, no pun intended!
The return and groundstrokes have pretty much the same intention. Learn and practice the basics on all of your shots, briefly walk yourself through the process mentally and soon you will be playing better. The more you do this, placement and control will become high priorities for you, and will lead to shots that eliminate unforced errors, keeping the ball in play, and allowing your opponent to make the mistakes.
Art has been playing pickleball since Nov 2017. He enjoys playing this active, low physical impact game of skill and strategy. And finds that it can be played at all levels competitively while being a wonderful way to make new friends.