Think about your time at your previous two startups and try to identify the roles/work that you enjoyed the most. Try to find a new position where your day would be spent doing mostly that type of work. For example, if you really enjoyed hands-on development, then focus on finding a development job. Make sure you are clear in the interview what it is you want to be doing all day. Within reason, hold out for a position at a company that seems like a very good fit for you. At your next job, when they ask you to do things that you know you won't enjoy say "no" if possible.