This post is framed as a laundry list of the things you've tried, but there's no information about your interactions with the men you dated. So I'm curious about what prevented those 120 dates from progressing forward.
How many different men did you go on the 120 dates with? How many men asked for second or third dates? Of these, how many did you accept? How many men did you ask for a second date? Assuming you get a second or third date, what typically ends the relationship?
There's really too little to go on here, but I've found a few common themes among other people who struggle with dating:
- They overrate their value on the dating market and set their sights on people out of their league.
- They're attracted to people who are bad fits in other ways. They may focus on winning over people who just aren't interested in them. Or they're attracted to people who have no intention of settling down with anyone. (EDIT: You wrote below that you set you're range from 30-50. That seems like a good sign that you're not being overly picky. Although, I would wager most 30 year old men setting up online dates with 40 year old women are looking for sex and not marriage).
- They spread themselves too thin, begin treating people like a commodity, and don't put effort into developing meaningful relationships, instead jumping from date to date hoping for love at first sight. You might be playing it like a numbers game, and that can be antithetical to building relationships. Online dating can make it worse, since it's so easy to just move on to the next person.
Also, it's unfortunately just much harder to date at 40+. The people who want to be married often are married by that age. You'll catch people on the rebound from divorces, but they're not always ready to jump back into a marriage. It's not impossible, it's just harder.
EDIT: I just thought of an online dating suggestion from my own experience. Use recent photos that are flattering but realistic. When I was in my mid-30s, I my hair began thinning and I didn't update my photos because I was so self-conscious. And as my hair loss progressed, my dates started going worse and worse. When a woman called me out on it, I finally updated my photos. After that, my dates had realistic expectations and I was no longer losing their trust right off the bat, and things improved immediately.