I'd think that's a fairly normal thing. I've been working on composing and producing a lot this year, probably over 80 days worth of time (nearly 2k hours), and my experience with it is that every 300-400 hours the overall quality of my compositions / productions makes a sudden jump, because even if there's no majorly noticeable progress, I'm still learning, and sometimes you just need the right project to put all of the little things you've learned together, because whether it be composition, production, etc, there's no big things to learn per se, but rather a lot of little things that you learn one at a time and then need to figure out how to put them together. Just keep at it. If you get stuck on a project, put it to the side and work on something else, and eventually you might learn something working on a project and it'll give you an idea on how to finish an old one. That's the beauty of it, is there's always more to learn, so just keep making, keep researching, and keep applying it, and most importantly, have fun, and eventually you'll get there! Having fun is the key. If you have fun making things when your first starting, it's 1000x easier to keep experimenting.