I would wait another few days, and try at least once more. Structure your text something like "Hey, it's CashewGuy. I was thinking we could go ________ sometime. Just let me know when's good for you." It clearly identifies you, and isn't so constricting time-wise. If he doesn't bite, that's unfortunate. I'd also recommend trying again in a month, then perhaps in another month. That's spaced out enough so as not to appear bothersome, but if he backs out or doesn't respond after two or three more attempts, it's a shitty situation. The only solid advice I can give you is to try and meet more people. I know that's not easy, and I won't embarrass myself with shitty tips on how to get yourself out there. One thing though, changing up your career (sounds like you could?) is almost guaranteed to gradually yield new relationships.