Yes what you are getting now is low $1500x12/500,000 = 3.6% approx. However, that ship has sailed. Yes you could sell and get your 500k less taxes and then reinvest but maybe looking forward you need to look at investments with higher returns of 10% range. I have posted before in Linked In that BRRR is not a great strategy since you have to master so many things.
You have to buy the property right and at a low enough price and find the funding to do so. Then you have to renovate the property and there are sooo many things that can (and do) go wrong with the rehab process. Then, if you get the renovation done successfully, you now have to find a good tenant. Then you have to manage the tenant and deal with maintenance and repairs. Now after all that, you have to go to a lending institution a second time and try to get a loan and there are many requirements to getting loans in todays environment which make it difficult.
Wow! So many moving parts.
Even just doing one of those is hard enough, but now you have to be an expert in finding discounted properties, rehabbing properties, rental and property management, maintenance, and raising capital and getting loans.