Have you looked at the state of how open source smartphone os projects are funded? Seems like not enough people think it is currently important. i saw no bump in funding since the announcement. I would say the best bet is trying to help one of these projects with fundraising and trying to educate or convince enough people it is worth investing in. and obviously donate if you can. Although to be honest even i don’t do that (i think i invest enough in FOSS).
Once i bought a phone i tried to pick one that is friendly for FOSS projects and went with a pixel (which grapheneos recommended). so voting or signaling with your wallet is an option.
I also think something like codeberg. where anyone can be a member if he pays fees that help fund the organisation and democratically elect a board that decides what to fund could be helpful. codeberg has a pretty good organic growth so that is encouraging but i don’t know if there is enough interest in that.
Lemmy has a similar number of active users and makes about 3K . That money would be good for the ecosystem and could help fund upstream projects (I am sure wine could use the money for example). But they will have to use fundraising methods similar to lemmy to reach that number (popup, good message etc)
The donate page is kinda a mess IMO to be honest. There should be one organisation to donate to otherwise this creates overchoice.