I don't know why you are stuck. But what I do know that chess consists of allot of things to learn, I am talking about more than millions of skills/patterns.
Do you know the cycle of learning?
Stages of Learning - Four stages (thepeakperformancecenter.com)
If you are stuck at improving. Than it is good to assume you are in stage 1. Search for that new information/skill you don't know about. Make sure you get to stage 4 on that and move on for new information/skills.
Where to search and for what is up to you.
Everybody is different, so that's why there isn't only one general way to learn. First of all, you have to discover your biggest weaknesses in the game and start working on them. The most effective way for that is analysing your own games. Of course, if you are a beginner, you can't do it efficiently because you don't know too much about the game yet. There is a built-in engine on chess.com which can show you if a move is good or bad but the only problem that it can't explain you the plans, ideas behind the moves, so you won't know why is it so good or bad.
Prophylaxis too - you don't allow them any checks, pins, outpost, he'll start blundering, I can almost promise you, thinking isn't their strong side. (it's true that Fischer said 'In order to get squares, you got to give squares, but my experience (club player level, of course) tells me, in order to make him blunder, you give him no squares at all, just slowly improve you position... king safety...)