Watch the Day 20 online guitar lesson by Ravi from Learn Guitar in 21 Days
You have the rest of your life to learn new songs, and I hope you do. Never stop building your repertoire! However, today, I want you to review the songs you are already playing, even some that you may be close to mastering.
Add a folk/pop rhythm to certain songs, classic rock/pop to others, maybe a rock/blues pattern to a few, or even reggae! Try arpeggiating a few as well, even ones that may at first seem like they shouldn't be played that way, you're the artist, enjoy your license!
Play songs that use only major chords as well as those that mix it up with minors. It's not all about learning; it's also about playing! So, make sure you frequently spend a little time just making music and enjoying yourself. Today is one of those days, so go for it!