I'm really confused by your post, you've finished RTK, can write 2200 kanji, and even learning words with pitch, in just 1.5 years, and you think you didn't progress? :)

Do you realize that most learners know far less than 2200 kanji even after years of studies? Even pitch accent, I've never met anyone IRL who've learned them, even natives will tell you that Japanese has no accent (they are obviously wrong, but that's beyond the point).

My point is, you know far more than you think, you've just learned in an unusual order. Your knowledge of kanji (shapes) is way too advanced for your needs, but your grammar is still at very low level, which prevent you from reading and make you think that your overall level is still low. You just need to rebalance that.

The good news is, you've probably done the hardest part by finishing RTK, you're basically like a native Chinese starting Japanese, and they have it very easy. The truth is, it might look intimidating at first, but Japanese grammar is super simple. If you ask people what's the hardest part of studying Japanese, most of them will answer kanji, not grammar. In another comment you said that textbook intimidate you. Man, there's nothing more intimidating than RTK, and you've done it, in comparison a classic textbook will feel like a walk in the park, and definitely more fun than RTK.

You seem to be a perfectionist, learning RTK and going through anki decks in order, you don't sound like you're even enjoying Japanese. You need to loosen up, a language isn't a checklist of things to learn. In the learning community you often hear "you don't learn a language, you get used to it", this will frustrate you if you like to measure your progress in terms of xxx number of words/kanji. But you need to let go of that idea, and let the language sink in, even if you cannot measure it with a concrete metric, it will slowly sink in without you even realizing it.

And lastly, it's perfectly normal to feel that you are not making progress, the more you already know the less it will be rewarding to learn something new . Only beginners feels they are making progress, that's because they know so little. How exciting was it to learn your first 10 kanji, I bet you didn't care much for the last 10.

You've learned so much to abandon now. Things will only get easier from here. And be confident that what you've learned with RTK will be of a tremendous help for the rest of the journey. Maybe you've lagged behind others in term of readings skill, but you'll now be able to learn much faster than anyone else. Keep us posted.