You can upgrade to a paid account at any time through the Oracle Cloud InfrastructureConsole. To do so, click the Upgrade link in the banner at the top of the Console web page. If you don't see an Upgrade link on the page you're viewing, you can click the Oracle Cloud logo at the top of the Console and then look for the Upgrade link in the sidebar on the right side of the Console home page. You will continue to have access to all of your cloud resources after upgrading your account.