In order to upgrade your server plan of resources just do the following steps:

Enter the desired server's page.
Go to setting tab, then find "Resize" section.

The current assigned and operated plan will be preselected like in the above screen,
All you've to do is:

Power-off your server
Select the higher plan that suite your needs.
Click "Resize" button.
Power-on your server again.
Enjoy the powerful resources.
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