Printing them helps, but I've printed out all of my favourite photos (~15 photos, size: 100*70cm) and it doesn't get me more motivated when I see them. But printing helps if you struggle with self confidence in your photography. (seeing them in a large format makes a big difference)
I don't take that many photos anymore, maybe because I have a higher standard than at the beginning and only think "oh this photo will not turn out that good, I don't make it". On one side, this is good but you don't have practice anymore.
Maybe it's because you don't know what to shoot. I only take my camera with me when I am travelling, I don't discover my environment anymore, like I did before.
Solutions? - Make a challenge (something like 1 photo every month) with topic-based photos - Ask another photographer to go out and shoot with you / or join a photowalk in your area - Ask a girl if she wants to make a shooting. If you don't have the confidence anymore to make good photos, ask a girl you already shooted with.