Lots of good advice in this thread! Here are my 2 cents:
1. Clarify your expectations. If you made a career out of your most liked ever thing, don't expect endless bliss from your hobbies! What exactly does and doesn't "winning" mean to you? Include feelings.
2. A decision is also a fare-well. Be clear and upfront to yourself that by deciding for one thing, you decided against at least 5 other things. Be harsh to yourself about that in order to get though to your self with the message. Wether you are a type for 2 or 10 activities, the basic principle remains. Do your thing and put all else away, out of your life. Make space for the stuff you want to engage in. Why do you even still have that TV standing around there? To shoot down your evening when you are most vulnerable?