One thing that improved my playing a lot was to play with other people. Then I wasn't playing the same old chords, songs and rhythms.

I'll second that. And go to see live gigs by people you like, or would like to be able to imitate, in terms of how they play. I've picked up a lot of tips that I could put into practice in my own playing, simply by carefully watching other guitarists and working out how they do things.