I think "nice guys" who have not done the work to deconstruct their internalized misogyny aren't always the nice guys they think they are.

I'm not saying you do anything wrong per se, but women are interested in having a fully invested partner, a partner who shares the full physical, emotional, and mental burden of a relationship and family.

I know, for me, when I was dating (I don't anymore) there were key words I looked for in men's speech that helped me determine whether or not they were someone who was interested in this type of relationship.

Most were not.

My guess is you haven't evolved to the place women need you to be if they're going to date you. In times past, women would accept their "best" option and make do. Now many of us are simply opting out of dating completely when we can't find what we're looking for.