Besides donating, being active Lemmy user and creating content helps the platform thrive.

Post cat pictures.

Donate to devs. Donate to your instance. Post. Comment. Be active.

• use smaller instances besides lemmy.world or lemmy.ml, this will increase decentralization
• donate to your instance hosts and important devs in the field
• be active and post high value content

Upvote all my comments.

Tell your friends about it, especially the ones who use reddit

The lead lemmy devs are struggling with funding - https://join-lemmy.org/donate

Sync isn't well updated / supported and I'd recommend moving to another client. I was a long time sync user so I found it hard, but I personally settled on Thunder https://play.google.com/store/apps/details?id=com.hjiangsu.thunder&hl=en_CA

You can donate to the devs https://join-lemmy.org/donate