I've had breaks and got stagnant in my playing too over the years. I started using youtube and picking songs that I loved but were beyond my level and taking the time to learn them correctly. I find it easier to have it broken down for me and I work my way through the song until I get it down. I couldn't play hybrid or with fingers only so learnt a few songs using fingers only etc. My fast VH lead style left me decades ago so I picked a couple Van Halen songs to work at, not to perform but just for fun and to get my speed back up. I just find areas where i'm lacking and learn a song that requires a high level of skill using those techniques. Learning it all and maintaining it on my acoustic helps too because of the extra resistance. Once clean and good on the acoustic playing it on the tele is a breeze. Other than that I have always noodled and improvised over tunes in my head or backing tracks.