In this scenario, you will have to include a condition in your Actions to check if these users do not belong to a group of whitelisted users.
One option is to trigger your other actions earlier in the flow before your three MFA Actions. In that way, when it reaches your checking MFA enrollment action, you can check if they are whitelisted users and continue execution. Otherwise, pass and do nothing. Similarly for the other two actions.
So basically there is no way to stop other actions to execute & we have to manage it with if/else pre-check conditions everywhere. In that case I feel it is better to put all the logic in one action instead of multiple.