new friends? but getting no feedback.

You can request features and send feedback using User Voice.

https://xbox.uservoice.com/forums/363186--new-ideas

You can also get your friends to vote on it as well.

Another option could be waiting until a new system update gets released to see if in that way the issue gets fixed.

Also you can try share this feedback with Microsoft via link below:
https://feedbackportal.microsoft.com/feedback

But I advise that if possible try getting a PC asking a friend to use it for a while. The thing is that you need to format your USB as NTFS first. Then transfer the files

Generally speaking, Microsoft's language options are based on user demand. You can use the Feedback Hub to provide input to the developers regarding adding a new supported language. If you share the link created when you enter feedback, I am happy to upvote it for you as well. You can also share it with friends and/or via social media to get more people to upvote it.

The only app I had was the preview app, it had no features apart from invite friends & unregister. Not many users had the feedback app.

The new app seems to be working well apart from the unavailable button on the feedback app download.

No, you can't get your friends to give fake positive feedback to fix your avoid me reputation.