Some of the advice I've been given here is that I give way too many fucks if it works out with the girl or not. I think that's very likely true. So I've been thinking what's the absolute minimum effort I should put in not to "underdo it"

I came up with something like this:

"Hi. I'm X. Here's my phone number(written on a piece of paper/business card). Text me if you wanna hang out sometimes. I'll be going now. See ya"

I'd like some feedback on this before I make an idiot out of myself in the field