You can vote everyday to earn free 25 credits.
Be sure that your account is linked before voting. First, go to your Minehut account settings which can be found here.
Click the button that says Link Account. It will give you a command. Go to the Minehut lobby and paste in the command it gave you and your account should be linked and ready for voting.
And then vote here: https://minecraftservers.org/vote/443456