The best way to preserve the fediverse is to provide support to it.
Pay your instance admin if you can, if you can't boost their fundraiser posts
Pay the developers who develop the software you use on there if you can. If you can't, boost their posts and help them fundraise.
Also pay the projects non Dev folks. Because they help Devs to focus on the code while they do community development, moderation etc.
It's an ecosystem and we can't rely on the whims of VCs.