this may not be in any way applicable to your situations:
what if you were to reply letting them know you got the message, you want to connect, but texting just isn't working for you — and instead could they Facetime or do a phone call or something realtime?
When I send you a text message or a whatsapp or signal or one of the many others then I am essentially giving you homework/an assignment. I put something in your inbox—on your to do list. Now you have to deal with this thing. My message, or insane flurry of messages, is going to sit there taunting and shaming you.
I've been part of so many group messaging threads and they can just become so way too much to point I can't even engage in that medium.
So I love the idea of communicating in a way that doesn't put a burden of response on someone—because it is happening in realtime. Instant messaging can be exhausting whereas a phone call or video chat can be life-giving. And when it is over, then it is over.