I've tried for a couple years on here, TKLFrat, Fetlife, Reddit, Grindr, and Recon. Any other sites or apps I should try out?
Don't try apps.
Whenever I was single I just chatted to random women IRL, and if they chatted back (and a lot didn't) sometimes we'd become friends and sometimes that would lead to more interesting things. Sometimes but not always. But at least I knew right from the get-go that they were female and that I found them attractive.
My success rate online was far less, so I generally stuck to chatting to the woman next to me in line at a theatre, or at the same table in the library, or at a bus stop for instance, rather than chasing an internet Wilhelmina o' the Wisp. Those are, incidentally, three examples of occasions where I did connect as per the subject of this website.
The leadup to my marriage to KT (15 years now) began when I began talking to her because she was sitting a few computers away from me in a London cybercafe.
Boring and pointless it may seem, but starting a random conversation about something inconsequential (that takes practice too) is what I'd advise for anyone, keeping in mind you'll usually be rejected at one point or another by every women to whom you speak. Yes, it hurts, yes, it's yet another blow to the confidence, no, it won't kill you and yes, you will recover to have another go with someone else, and the sooner the better if you don't want to be an incel.
That's romantic life for pretty much every man, and no-one said this was easy.
But keep trying, roll the bones, and good luck.