I've found that I say "We should hang out soon" or any version of "we should...." and then nothing ever comes to fruition. What's a better alternative to this?

For example, a text conversation I had today:

Girl: "Hope to see you soon. I miss you"

Me: "Ya we should definitely hang out sometime"

Her: [Doesn't text back]

(Yes, I'm awful with texting).

How can I word this in a way that gets results?