If you use enough of these sites for long enough, getting unfairly banned on at least one is probably unavoidable. If support can’t or won’t help, you’ll probably lose any earnings you haven’t already cashed out. That’s why on most sites I try to cash out as soon as I hit the minimum payout threshold.
To try to avoid getting a surprise ban, pay close attention to the acceptable use policies across these different sites.
A lot of them only allow one account per household, so even someone else signing up on a shared internet connection, or you just using a Wi-Fi connection when visiting a friends house, could be enough to cause an issue. Be super careful where you login to your accounts from.
If you are temporarily visiting another country (on holiday etc), you should never login to any of these sites from there. Doing so will almost certainly get your account banned for being used in a different country.
It might even be worth uninstalling any survey / “get paid to” apps before you travel, just to be on the safe side, as they will probably be calling home to check for app notifications for new surveys etc.