How to create a creative model in my world?

My world can only be created by typing the command /gamemode 1 In my world, the creative mode of survival and change is entered by t /gamemode x, where X represents an effective number 0, 1, 2; 0 is survival mode, 1 is creation mode, and 2 is limit mode. In the creation mode, the player is invincible, has no blood, and all props can be used indefinitely. You can build things that can be destroyed, but you can't collect things that you destroy.

My world:

Players can freely choose the game mode [survival, creation, adventure, limit (Java version only) and spectator mode (Java version only)]. Experience different interesting ways of playing in various modes, enjoy playing monsters and taking risks in survival mode, and enjoy being a creator in creation mode. The theme of the game is that players can freely create and destroy different kinds of squares in three-dimensional space. In the game, players can complete the achievements (progress) of the game by destroying or creating exquisite architecture and art, or collecting objects to explore maps.