Seven days to play alone?

I would like to gamble 7dtd on my Xbox One X in the future.

Is the game playable on its own, so it's fun too?

I have often heard that it alone should not be fun and that it is too difficult to create… Is that true?

Is there somehow the possibility of a server with another RANDOM player can play together? None of my friends wants to test the game.

Instead of playing with Randoms, you could look into the community section for Seven Days to Die and there teammates (German teammates). I also did it with ArmA to learn first