Well, there's no harm in looking around. I assume you're not going to just quit this job without something else lined up, so asking whether you should stay -- before you've checked out the alternatives -- is a little premature.
That said, if you want to stay PT and you can afford to make as little as you do, then IMO you should stay where you are. Lots of people want PT jobs (including me), so good, interesting, non-career-killing PT jobs are hard to find. Yours sounds awesome if you can afford it.
If you want to go full time to make more money, then you'll have more options.