I’ve had my mortgage for 3 years. I have $220k left on it, my home value is $300k. Im paying MIP. Should I refinance?

Basically, title.

I've had my mortgage for a little over 3 years now. I have $220k left on it and 26.5 years.

My home value is $300k conservatively, maybe $310-315k on the higher end.

Im paying MIP. My LTV is 73% using the $300k assessment.

I thought MIP dropped off once your LTV goes below 80%??? But here I am, still paying the $105/month MIP.

My current interest rate is 6.6%, it's what was the best available rate at the time. I've a car payment and a few credit cards too. Never missed a payment on anything, I have perfect credit.

I could either refinance and save like $150/month in principle and interest alone, or refinance a 20y and pay $150ish/mo more in principle and interest and shave off 7y of my mortgage. Doesn't sound too bad of a trade off, it would save tens of thousands in interest.

What's your advice here? Is there anything I'm missing or any other options that would be better?