We do not currently have plans to do any of the things in the title of this thread to Gambit.
The team is eyeballing a future season for some improvements to the mode. We have opportunity for some minor changes in Season 15, but deeper improvements to gameplay will come in a later season as we look to balance workloads for the team.
We'll have details in a few weeks about various reputation system tweaks. Some of the roadwork for this was done in the Season 14 patch - we talked about that in a previous TWAB.
While we've been asking for feedback on Gambit for a while, always love to hear what you think about the mode. What's enjoyable, what needs improvement, etc.
Cozmo and I will make sure to pass it up to the team. Even if the feedback has been said before, feel free to say it again!