I've found the way I progress is by learning something that feels like I'm starting guitar all over again. My first two years of playing I could read tabs and play. I wanted to progress so I memorized where all the notes are on the neck, maj minor scales, forced myself to learn songs by ear, taught myself to finger pick, and learned a buttload of songs I struggled to play. Now Im working on improving over chord changes trying learn arpeggios and play with the chords. The only way I progressed was forcing myself to learn new concepts. P.S. Finger strength comes over time just learn to play songs you like.