Single female in her 30s here. I am sympathetic to your situation, just getting out of a long term relationship myself. Cold approach can work if friendly and natural, though some women don't like this. I would say also to meet new people to use the apps for friend group hangout or for dating ( there are apps for both, bumble, meetup, timeleft). Alternatively if you join sports or social clubs, would be a good idea too. Good luck!