Don’t waste time in the air learning things you could have learned preparing for the flight on the ground. Know your flows, drills and checklists intimately before you get into the cockpit.
Fly your armchair in real time around the circuit, or on a navex.
Expect to have the odd day where you fly like a drain. Don’t beat yourself up too much about it, just go for a beer and forget about it then work the next day on what you did wrong.