Upgrade from Free Tier (LightSail) to a paied service

Hello.
To change the Lightsail plan to a larger one, a snapshot must be created from the current Lightsail.
It is possible to change to a larger plan when creating a new Lightsail from the snapshot created.
https://repost.aws/knowledge-center/change-lightsail-plan

There's no free tier in Lightsail. All plans are paid, but maybe you got 3 months free depending on the plan you choose. There's no upgrading a existing plan either. You can feel like you upgraded by deleting your low spec instance plan and creating a new higher spec instance plan.