For those who are active in Layer Zero and zkSync networks, there is good news: "Layer Zero is now live on zkSync Era mainnet" - https://twitter.com/LayerZero_Labs/status/1651588515652845568. This means that when interacting with one of the networks, there will be count interactions in the other network as well.
If Stargate Finance would start having a bridge to zkSync that would be great. Been using them to transfer between chains and they've been great so far. Just a couple of bucks in fees and never had any problems so far.
Anyway, there isn't much to do in zkSync besides the usual. And there isn't much stables flowing in that would make devs offer their services in the chain. I saw a new lending protocol tho which should come in handy if you want more chain activity.