I've played guitar for about 5 years (although i haven't been that serious about it for the past 2-3 years and now am playing much more seriously after not playing for 6 months). The fingers on my left hand are pretty agile now because in the past my goal was to play really difficult things to make myself feel accomplished, but now i want to improve my playing and sound better. Recently I've been paying attention to detail more, and I'm realizing that i need to practice techniques like my strumming, alternate picking, bending notes, etc. In the past, I didn't really care about all of the fancy techniques when I learned songs, so now it's more difficult to make the music sound really good and articulate better, and I'm not very good at alternate picking (i used to ALWAYS just down pick every note and I played mostly lead songs so I'm not very good at rhythm, specifically strumming things). What should I do to improve my playing overall? I know i need to practice strumming, articulation, bending notes, bar chords, minor and 7th chords, alternate picking, finger picking, and other kinds of picking, but what should I do to improve them? is there a way to practice them, and should I learn to play classical style or something? Should I grow out the nails on my right hand?
Thank you in advance!