I enjoy continually seeking out new song material, or polishing up & recycling & perhaps re-inventing established repertoire. This may include trying out new styles (often of a totally unexpected genre-groove) or working out different more interesting chord changes, or working out new soloing ideas.
I find new ideas by listening to as many 'different versions' of a given song as I can find on YouTube, Spotify, iTunes, and internet radio stations. I typically distill and develop my own version from these. I can usually find most lyrics online and then compare this with the heard recorded versions. Chords are often included with online lyrics so this gives me a 'starting point' to go by for the chord progression I may decide to play. I then sit down at the keyboard in pianist mode and play along with the different recorded versions heard to pick up essential 'hook lines and/or riffs', and then determine what arranger style best suited for my rendition. Once I find the appropriate arr style, I create a lyrics and chords text file (.txt) to display on my Tyros 4 LCD screen. I then work out a Tyros 4 arrangement (voice selection, style variation/fill changes, vocal harm. settings, etc, and save these to regs 1-8), and get this memorized & ready for gig performance. I try to devote a few hours a week doing this and find it very rewarding as it keeps my show repertoire fresh, interesting, and inspiring for both myself and my audiences.