For Insta, .... it's beginning to become problematic as it's becoming more and more frequent that a post doesn't get cross-posted.

Touch wood, I've not had a problem - either from my personal accoutn (handle the same as steemit) and from my Destination McGregor account. I mention the latter because I use / repeat many of the same hashtags and it's linked to a FB account and I've not (yet! happily) had a shadow ban. I've had issues when my hashtags have been more than 30. That's it. I do wonder if it's got something to do with the ownership (Facebook) which sees the posting to other monetised platforms as competition as they try to make money themselves. Just thinking aloud.

I don't know yet how I'll do that, but I will :D

I have no doubt! LOL