How to identify my guitar playing problems

So I've been playing for about year and a half now. I've made some decent progress. However
my progress got stuck. I realize that I have to make some kind of practice shedule but I don't
know how. The way I see it is I have to identify my guitar playing problems and then pracitce
exercises for fixing them. However I can't really do that. When I can't get something up to speed (by starting slow and then gradually speeding it up ) I realize that my technique is obviously wrong but I can't really tell what exactly am I not doing right.So if anyone has any suggestions about what should I do I'd be pretty happy to read them.

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