In my experience about recruit volunteers we need to think:
- Area where there is a lot of todo
- tasks that we (as committee) can delegate
- what we can do to simplify the onboarding
- what we can do to improve the promotion of the project
Just few ideas after reading that list 
Translations:
- We are looking for reviewers for the various locales. If the actual promotion is not working means that Twitter is not the best tool for that. Example: in Italy is more used Facebook then twitter, I guess that is the same also in other countries
Core:
- people that share feedback about the issue on contributing to the project as developer. In that way we can start to improve that like with tutorials/handbook.
- help on Integrate patch from 5.0 · Issue #153 · ClassicPress/ClassicPress-v1 · GitHub (it is written everything in the ticket)
- I think that James can do a list of tasks that can delegate to others
- I started a doc about how to use the backport script and asked to Paolo (that made few pr) if want help
Meta:
- I am not sure if we want to open this area to new contributors because right now we are in a phase where the websites are migrated to a single network instance.
- Involve more the people on slack on contributing instead only discuss, maybe do a survey about type of skills we have in the community and what we are lacking?
Marketing:
- Things that you can do with ClassicPress and not with WordPress (for this one maybe is too soon)
- What do you think about do AMA on Reddit or Discourse about the 1.0 release?
- What do you think about a live video with committee members that reply to answers from the community?
Just remember that this is a way to getting involved/contribute because we improve our engagement
Personally I think that the project need more active contributor especially on Core or everything will be for @james and as a community project this is not good.