Is change of plan possible?

I am a little disappointed with the quality of the translation from Spanish to Norwegian in some cases. Bad translations and sometimes errors that mean I have to double-check to find out what is correct.
I have a premium membership paid for one year which is valid from October 2, 2025.
If the quality of the translation is better with Premium Plus, then I would like if it is possible to switch to a Premium plus subscription, with monthly payment, and I hope that you can change my membership to monthly and set a new due date based on what I have already paid, so that the monthly payment for Premium plus starts when this date is reached.

You should be able to switch from the account page. Please let me know if anything goes wrong.