The old me would have said you should leverage to the hilt, but I’ve changed and so has the market. Definitely get rid of the pmi, and refi. You probably aren’t going to find a better deal than what you got in 2011. If it’s an easy rental I wouldn’t give it up unless you have something really great lined up.
That being said, I’m also of the mind that you will never time the market perfectly, so it makes sense to sell at any point you know you are coming out on top. What’s your side business? Would a little cash injection boost it? I would look at that too. Or find another small business that spits out money. I bought my first in 2009. Haven’t bought anything since 2015. I’m currently selling most of my stuff. I’m paying off all my debts and padding for the next downturn. I flip houses with other investors but don’t put my name on it because I don’t want to get stuck. I do the rehabs and either split profits or take the gravy on the backend. There are a ton of options out there. I also have a PM company, lots of ways to make money in real estate.