Make sure you have at least one character with 2 resets on your account, do not store items on characters without 2 resets, take all your items from the guild bank.
Servers will be turned off on 26.02.2024 at 13:00, then the merging process will take place. Merged server will open the same day after ~23:00 if no problems arise, but a slight delay is likely. Dude all info is available..