How do I finish the round and start the game again if more than one player has joined?

I need to make it so that when a second player joins the map, the game starts all over again.

The fact is that I have a Gun Game map and if the player is alone on the map, then he can kill bots (guards), while changing his weapon to the next one. When more players join, the first player’s weapon remains, and those who joined the initial weapon (the first from the list of items issued).

You need to make sure that the game starts again, and everyone has 1 weapon.