Or tenants won't care if the new owner keeps the lease unchanged?

For example, this week the Fed said that it would keep current policy unchanged but increased its forecast for economic growth, prompting economist to predict interest rate increases in 2023.

Since the storms happened before March 15th, even S-corporations and partnerships in these 3 states have time until June 15th.All the other eligibility rules are unchanged, such as having a legitimate business with active income. 

Your initial cash flow is likely modest because you are willing to do significant work yourselves (otherwise it would likely be slightly negative), but this cash flow is likely to increase at a fast rate (historically has been the case and indicators are unchanged). 

But either way the basics facts will remain unchanged.

But with long term fixed financing, as long as you can keep the lights on recessions won't bite you; my costs will likely remain virtually unchanged.

I really do want to keep her and make the last years of her life as unchanged as possible.

However, like Chris also mentioned, your loan payments may even remain unchanged  if your are considerably lowering the interst rates on your current loan (Like with the 12-15% rates you will usually see from a hard money lender or prime rate mortgage.) if you are doing this for yourself on your personal property however, then the benefits lie in that you can get back all of your down payment on your home, releasing cash for renovations, paying off debt, etc. 

And given that it is determined by the market (at that point in time) and unchangeable by you, the only remaining factor in the formula to determine property value is the NOI.

But you absolutely cannot tell me that the entire world will change around you, and RE investing will go on completely unchanged because of the "personal touch" aspect.