Dont know if anyone has any experience with this but i have a vpn plus account for 2 years and want to upgrade to unlimited soni can move my domain mail and stuff to proton. But i cant find any option for this or im blind. Do i now have to make a separate mail plus account? That would make the bill something like 380 euro for 2 years (since i already paid for vpnplus for 2 years) thats a little bit to much. Or is the only option to wait for my vpn plus to end (which is in about 20 months)?
You should just be able to purchase ultimate and the itemized bill (before you click buy/purchase) should have some credit on it from the subscription you already have to Proton VPN.
I think it's in the billing settings for your account where you can change all this.
Click the settings gear next to your username in proton mail, then click "all settings" and then "explore other proton plans". If you have a current paid service, the remainder will be credited towards the new purchase.