I think now is a great time to remind everyone, like sync’s developer, Lemmy’s developers need to be paid too! The amount of time all the devs put into making lemmy exist, in my opinion, should be worth some of your money. If you can afford it, donating to the people who develop lemmy and/or the people keeping your home instance up will accelerate the incredible growth of lemmy!
Like every open source projects, you can donate with money or your time. Both are equally valuable. Promoting the project, helping new users, heck, even being pleasant and help fostering positive environment in the fediverse so new users feel welcomed is actually very valuable (especially given current reputation of fediverse citizens being especially harsh to new users).
To add to this, it can even be as simple as reporting bugs you find, whether that be with the Lemmy code itself or a client your using.