At this point any reddit protests need to sort focus on tarnishing the platforms reputation further. They've made it clear they won't course correct.
Top of mind, spamming the subs with content that looks bad for them to remove. The ideal would be dirt on spez (e.g comments he made on /r/jailbait), but it could even be something more reserved like a charity link or "why I'm leaving" memes.
July 1 is a good excuse to get another news cycle out of this, and warn potential investors skeptical of the future of the company.