I've been in your spot before. What I did was switch barns & trainers. It really helped and where i'm at now is amazing. I always feel motivated and confident. You just have to find the right people to be around and train with. That was the key for me
I've been in your place so many times! Riding ruts are the worsttt and drain you of all your motivation ! Sometimes I find if I am focusing on excelling on two many things at one time I get overwhelmed. I am currently training for show season in hunters and training level dressage and I feel very similer to what your feeling! Try only focusing on getting better at one thing at a time , maybe just flat for a couple rides to re stable your leg so your jumping position will be stronger, have a purely eq ride over ground poles to rebalance your self. Sometimes trainers can also hold ou back. If you feel like you haven't learned anything new in a while it may be time to move on! Good luck!
Yes! We've all been there. The BEST cure is to start riding as many different horses as you can. Any horse, any time, any place. You'll start finding that this experience gives you insight in small ways about improving small things about your riding to accommodate the different types of horses, and over a period of time, this ads up to BIG changes and improvements. Riding many different horses is the best way to become a good rider.
I have definitely felt the same way. Like Victoria and Emma said, taking lessons is a great way to improve. But another important thing to do with or with out a trainer is to read as much as you can. That way you can mentally have that knowledge as well as implementing it and creating muscle memory and feel. That really helps boost your knowledge level which can help you understand what is wrong and how to fix it. :)
Like Emma said you can try and find a trainer or fellow horseback rider to help with riding. If you feel like your getting worse don't put yourself down. In order to become an amazing horseback rider you'll have to learn what works and what doesn't. I'm still trying to figure this out myself.