Co-ed sport leagues. Church. Art classes. Local Facebook groups (they have them for hiking groups, people trade or sell furniture and goods, etc. Don't waste tons of time speaking online-only, especially if you use dating apps, meet them in person ASAP). You just have to go out more and practice being more social. Get used to giving your number to a girl even if you're only in passing. Just a "Hey I'm so sorry, I'm in a rush. I'd love to speak with you sometime." And hand your number on a scrap paper. It's no pressure for her to text back or not and you don't have to be super invested in getting a response or not. Especially if there is no telling if she is single or not. Who knows? Maybe she'll have a friend she might want you to try talking to instead. You meet people in funny ways sometimes.