After cold approaching, I would say 60+% of numbers never respond to my first text. I’ve never considered myself a good tester, but is this a during the approach problem or after approach problem?

I don’t text right after, usually same day later or next, I give them something to respond to I.e. I cold approached a more traditional/reserved girl before work and texted her after how was work to no response.

Is this a problem In my texting style or approach? Any tips to improve?