I haven’t really used many of these tools myself: I just know they exist, see other projects using them and think “That’s cool!”
If I may suggest one other GitHub feature: an organization. This could have all Rhasspy repositories under one umbrella. Especially with the process now of splitting up Rhasspy in various services, this could be interesting: people can find all relevant repositories then in this one organization, not cluttered by other unrelated repositories. Existing repositories can be transferred to the organization.
It could also let the project scale when it attracts more developers: you can manage fine-grained access to your repositories, manage access to project boards and so on. I don’t think you can do that currently on your personal GitHub account?
I’m happy to help with all this. Maybe setting up an organization for Rhasspy and giving me (and anyone else who wants to help) access rights to project boards is a first step to find out how we can manage/visualize development progress?