So I got out of a relationship recently and hopping on the tinder game

I hooked up with this girl last weekend and then again this weekend. Pretty sure she is just in it for the sex and it was great sex both times. We haven't explicitly made a fwb agreement or anything

However, i want to get her more invested in me, or at least remain in her mind. How do I do this over text?

These principles go into building a roster. I understand "text only for logistics" but my job sometimes has me leave for 2+ weeks at a time. I can't be meeting up with girls at the expected frequency other guys might be.