@Account Closed congratulations on having these "problems"! It means you have built quite a bit of equity which contributes directly to your networth. I think you are on the right track that believes real estate can build wealth, now is the matter of how to use the equity efficiently to generate more cashflow and more wealth. I was in a similar situation, too. I think refinance out your primary home might be a good idea since the rate has been sooo low and it could free up some "cash" for you to do more investing. On the vacation rental I would probably refinance, too, and also explore the idea of Airbnb to maximize your income potential.
On your other question, I would ask yourself that would you prefer to be active or passive real estate investor? Both has it's perks and doesn't mean one is better than the other. Active RE investor will have to take on more responsibility and need to spend more time on RE, in general, compared to passive investors. I've been to both sides and it really depends on what you like and what your goal is. There are so many resources on BP and I think would help guide you through this journey. Again, great "problems" to have :)