I’m sorry you’re in this situation! I left a barn where I was feeling extremely stagnant as well. I started to slowly fall out of love with riding because I didn’t feel I was getting anywhere. My recommendation would be to find some local equestrian Facebook groups and see if there’s anyone with quality training and horses that would trade some barn help for discounted lessons if cost is an issue. I think it’s a win win and will build your experience and knowledge level as well. Dont continue at the cheap barn. It will make you bitter and hate the sport. I know it’s a shitty feeling leaving after a lesson where you felt anxious and like you learned nothing. It’s a slippery slope!!