A sense of humor is a good thing to have in videos like yours. If it's not your strong point though, don't force it. I think you're doing pretty well for yourself so far. Let the jokes come naturally, but don't go too far off track. Remember what you're target audience is coming to your channel for. Try to say your jokes while you're still showing them how to do something.
Oh, and another tip: Try to incorporate more close-ups of your project. While you were putting glue on the money, I was thinking it would be nice to see a tighter shot of what you're doing. It takes more work, especially by yourself- but it's a nice touch.
Keep it up though, I think you're doing pretty well for yourself.