There is no simple answer to your last question but To me hthe fact you are asking could mean you are too attached to saving your M, and fear doing the wrong thing. There is no right thing or wrong thing. OK there are but don't put so much pressure on yourself.
A piece of good advice is to ask yourself regularly what do you want to do. Apply this to simple and more important decisions. Remove the pressure of determining what is best to improve your M.
Got to go.
Best wishes. I keep you in my thoughts
R 25 years M 14 years S11 & S13 Working on it alone since Oct 2014 M in trouble a lot earlier (~2 years) Feb 2016. 1st R chat in a yr. Next R chat Aug'17 Still together
