I don't think you can really force yourself to be in the mood- it'll always feel like a chore then.
Being in love with your town/villagers and having goals you want to accomplish while playing are really important to stay interested in and excited about ACNL, though.
If you're having issues feeling passionate or excited about your town, maybe try restarting or try getting more of your dream villagers? It took me about 7-9 different towns, but I have finally found one that I'm in love with and am excited to play every day. And part of that is that I finally have a town full of dream villagers, but it's also just the map/town itself.