Team up with other creators: find a scripter for your map, an artist for your mod, a video editor for your trailer, or join a project that needs your skills.
Posting a project
Title: what the project is and who you need, for example "Open-world racing mod looking for a 3D artist".
Describe the project, its current state and what is already done.
List the roles you need and the time commitment.
Say whether it is unpaid, revenue-share or paid. Paid work can also go in Jobs & Recruitment.
Show something: screenshots, a repo, a design doc.
Guidelines
Be clear and honest about scope. "GTA 6 but better, need everything" will not find a team.
Reply publicly with interest, then move details to DMs.
Update or close your thread when the roles are filled.