Advice on SNS etiquette

While I've turned up for a few meetup events and bonded well with the people present, somehow when it comes to texting, I receive the message "今日楽しかった! ありがとう!" And I'll respond with the same and not hear again.

I'll try to say let's meet again or ask them more questions about them, but they don't respond even after seeing the message and if they do, it's just kinda like no I can't meet and then ghost, even though during the meetup they were talking about plans and stuff.

What's the way to follow up message on that initial message so that I'm not pushy but also not completely disappeared?

by domo_yoroshikuonegai