You need a proper message board.
I can't say for sure how long I've been a Textra premium user. I think you could call me "Twice Grandfathered". lol
I find it amazing that we have the ability to request features and search help files but you've never taken advantage of the fact that there are a good number of us out here that know your product well enough that providing a proper separate forum where plenty of people like me would be glad to volunteer would be able to respond to such requests letting users know how to access those features and manually combining similar threads which would drastically reduce the number of outstanding future requests.
I have seen quite a few requests in the past to allow some of us to help moderate because like me, you have quite a few people that are passionate about Textra and want to help. Those of us are driven to offer to help...for free on each post that I've seen it, probably for the same reasons... Because we understand that reducing your workload and improving your overall customer satisfaction ultimately allows you to get us new features faster.
It baffles me to see how to frequently you received offers to help in this area without advantage of it.
If you simply don't have the time and resources to put towards it. I've considered launching an unofficial help board much like some of the unofficial Microsoft sites that always seem to generate much better and faster solutions than official channels do but something like that would do nothing to reduce The number of requests for features that already exist and wouldn't be accessible through the app which kind of defeats the purpose so I haven't bothered.
If you don't have the time and resources to do something like that on your own, I would be more than happy to do it as a partnership, free of charge, using a server I already run, with whatever language you desire to solve you of any liability keeping it clear that it's operated separately, provided that it would be accessible through the app in place of the current feature requests. This would provide a win/win solution for users AND Textra in several ways.