It'll take huge efforts to persuade a very large number of people who seem happy with what the techno-fascists offer.
FOSS alone won't cut it, because the same techno-fascists end up funding, and eventually owning the reins.
Then making cost-of-entry prohibitive.
We can have niche platforms (like Mastodon) where once critical mass is reached (25M users), it will sustain itself.
Persuading a center-right population is a tough ask. That's where we need success.