Have someone out to come video you, you can find the flaws in your riding and fix them accordingly! No stirrups once a week, at the bare minimum!
You can practice riding without stirrups in order to build leg muscle and help with your position.
Practice your 2-point it will built up your strength and putt everything where it should be. You can also practice rolling your shoulders back and putting your chin up and looking forward while riding.
Lots of pole work trotting poles anything like that