If your project has a finish date, you’ll need to plan for what happens afterwards.
You can start preparing for a transition by gradually giving young people more admin rights (they get permission to do certain things on your server).
Then, towards the end of the project, you can ask them if they want to continue the community themselves.
If you pass on full server control encourage the young people to think about how they will keep the community running and keep people in it safe. Make sure you let parents know what you and they have decided.
Grapevine made use of Discord admin roles which allow users more permissions and control in the server. People with these roles were able to set up channels, and to introduce “bots” (small bits of computer program that handle certain activities). Mostly the bots were used for playing music - but there are several possibilities.
The young people with admin rights had their own sub group where they kept a to do list. They used this to manage and make improvements to the community. By the end of the project it was fairly easy for them to take on running it themselves.