Just do it

Stake sui natively across different validator
Hold multiple SUI LST namely ha and use them actively in defi protocols - in LP , Farms , use to loop assets
Use Aftermath , 7K , Kriya as your Go-To-Dex
Bid nft of recognized collection when the price is not hyped and just hold them in a cold wallet
Get yourself you identity SuiNS , and vote on proposal actively
Test out walrus and application on top of it - tusky tools

That's it for now i will keep updating this list periodically