Minecraft is different from quick mobile games because it is open-ended. There is always more to build, mine, explore, organize, or fix.
That means you need a project-based stopping point. Before opening Minecraft, name the goal: finish one room, gather one resource, explore one area, or play one timed block.
Use Apple Screen Time for the daily limit and Sandflow for the session timer. When the timer reaches your limit, stop at the next safe point instead of starting a new project.