This is a question only you can answer, look inside for the answer. I'm being serious this isn't some campy quote. At the end of the day your looking for the answer that you already decided on you just need validation. Sometimes the emotional peace is worth more than the money. My thoughts from the little I know about the raw numbers however:
1) You have no reason to not raise the rent at least a small amount to compensate for the extra cost of ownership the past few years. If that's 25 dollars or 300 that's entirely up to you provided you comply with the law.
2) You could pull the equity out in a cash out refinance, and use the proceeds to purchase another property and keep both. Run the numbers and make sure the extra work would be worth the money. ( Now you have 2 or 3 tenants instead of one)
3) Remember to add a risk premium to your new venture, whatever it is or how that looks like. You could get a non paying tenant or a bad well. The grass is not always necessarily greener, though it may appear to be on the surface.