The main thing is logging into your brokerage account(s) at least once a year so the custodian knows you’re still active. Laws vary by state but a sounds like it’s often 4+ years of no contact/activity before they have transfer it to the gov’t.

More broadly, you can lobby your representatives to require stricter criteria to be met before assets can be escheated in your jurisdiction. E.g. phone calls, multiple pieces of physical mail or have mail returned as invalid address in addition to the basic timeout period.