I think I might need help..

Dude, I have gone through the same thing over and over again, years of progress have been wiped and my technique has changed multiple times. Persistence is key,it takes a long time but you will start to see real progress if you practice the same things day in and day out. Its all about having the self control to not go fast and to make sure you are confident at the level you are at.

First let me ask you a question, What do you consider slow progression exactly?
Especially the technical stuff takes a long time develop, none of the people you see doing all the crazy tapping, sweeping fast stuff developed that within a year(at least us regular human beings don’t). It takes years and years of dedicated practice to really nail the technical aspects of playing so maybe you’re not progressing that slow but are slightly impatient.
If that’s not the case and you really just hit a plateau(or are stuck in a rut however you want to call it) the best way for me to get out of it is by exploring new things. It can be new styles a new technique or whatever just something new that excites you and gets you back up practicing.

Most of your struggles are mental. Over thinking and not just playing.
It takes a while but if you take your stuff a few months apart you’ll see the improvements

hmph you can record yourself playing and analize your hands to see if you have struggle with your picking hand or how you press the strings, also like ids said the progress takes years, and for example don’t rush yourself trying to do what other guitar players, like syn for example, do cuz they spent more than 10 or 15 years practicing that stuff, so you have maybe to put the same amount of time than them to play their stuff at their level that will prevent from getting down or frustrated, cuz you have to think im not stuck, just i need more time, you may not notice progress on high speeds but may it is on lower speeds, the progress of a guitar player isn’t necesary tied to how fast you can play of if you nail 20 different skills, the progress is that you play what you know till now with the perfect technique, what i mean is that if you play slow but you have a really good sound and nail alt picking at a slow speed you have progressed more that a person who plays super fast but doesn’t have a good technicque or plays with no syncronization at all .