What's in free and what's in the paid tiers of GitLab
You can always continue to use the free version of GitLab; there is no time limit on your free account. However, it's also helpful to familiarize yourself with the features available in the paid tiers of GitLab.
If you ever want to upgrade your account, you can do so in your account's Billing page. You can also find the GitLab billing page in your account by clicking on your avatar (in the top right of the main navigation bar), then going to Settings > Billing.