Hi Gabor,
great that you are active in the project. Feel free to ping the developer mailing list here, if you have a PR that is endangered of rotting away :)
You can see who is part of the project by checking the org site:
https://github.com/tox-dev - who can do releases you can see here:
https://pypi.org/project/tox/ (maintainers).
A bit about me: I stumbled into the the project last year, when I attended the pytest sprint and since the beginning of this year I am being given 20% of my time for OSS work by my employer Avira. Over the last months I used almost all of that time for tox and I have been spending it exclusively with bug triaging and release management. I will keep doing that, but I have to be careful that I don't stop having fun with it, so that's why I also take extensive breaks now and then and I won't feel guilty either :)
Cheers,
Oliver