Short answer: lean methodology. If done correctly, you can do a market validation test/MVP in a matter of days/weeks for each of the 3 ideas and at a minimal cost. Based on the results, you should decide which idea to invest all of your time on.
Here's a link to a past answer I gave explaining how to do market validation: https://clarity.fm/questions/6423/how-do-you-do-market-research

If it's too hard for you to let go of the other two ideas, and can't delay them, recruit a founder who will be the CEO (not easy relinquishing control, but better to have a part of something than a part of nothing). But only bring in another founder if you're the type of person who can 'let go' - if not, you're just going to be sucked in and eventually find yourself working on all 3 ideas.
[I'm curious to hear what the ideas are. ]
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