I nowhere near an expert so although I've won the title game a few years I'm inept enough to have down years so I can't get bored of winning too much.
I have a mega-world and I have a 10 year contract with myself on a team. After 10 years I skip town and start anew in another league or possibly even in another country. Keeps things fresh. Also when you are having a bad year or get bored I look at what's going on in other leagues. I've created so many associations, tournaments, and winter leagues etc that there is a lot for me to follow.