i don't think you should quit doing art, you are good just need your spark back, the thing that makes you enjoy it and inspiration. as for art school... debatable, some say it's worth it while just as many say not, nobody is too old for school again but some courses are surprisingly less important then one would believe

thanks, but its sometimes I feel like I'm going to nowhere with like i'm spinning my wheels

then try things outside your comfort zone, different style or themes you arn't used to drawing normally, experiment with what you can and can't do and haven't done

Never quit experiment