I agree, get yourself out there meeting new people, male and female, of similar ages, and try to build friendships, both male and female.
Doing the same thing over and over again (i.e. dating apps) is indeed insanity as you're always going to find the "same kind" of person matching with you. It hasn't worked for you, so don't keep doing the same thing.
There are lots of men out there who aren't on the dating apps, aren't trying to meet women in pubs, and aren't out there chatting up random women playing the numbers game. You need to find those men - the quieter ones, the less confident ones, etc - make friends with them and then a relationship may start organically - they're the kind of men who aren't going to make the first move, so sometimes, you have to be friends first, to kind of "drift" together.
My DH is one of them. He's literally never asked anyone out on a date (not in his teens, not in his 20's, not even me!), never had another girlfriend, never gone out with anyone else. He'd never go on a dating app, never try to meet women in a pub, nor chat up a random women. It was "painful" getting together as he was so shy and lacking in confidence, but we became friends through voluntary work and kind of "drifted" together over several months and started going places together and doing things together. Once he got over himself, he was a good boyfriend, good fiance and now been a good husband for 30 years!
They are out there, but you need to put yourself in a place where you'll meet them, and then you need to be assertive rather than sit back and wait for them to make a move.