I've been playing for about 3 years and hit a wall recently. Felt like I was just cycling through the same songs and chord shapes.
What finally helped was deliberately picking songs slightly above my comfort zone — stuff with unexpected chord changes or rhythms I hadn't tried before. For me it was "Blackbird" (the fingerpicking pattern forced me to think differently) and "Jolene" (that tempo is deceptively tricky).
I've been using chordroom.com lately to browse through songs by difficulty and it's been solid for finding charts that are actually readable. Their library is massive (260k+ songs) and it's free without the paywall nonsense.
What songs pushed you to the next level? Always looking for new challenges.