Mobs not spawning around world spawn (random spawns)

Hello!
I have an issue with mobs not wanting to spawn in a wide area around spawn. They start spawning when I'm about 60 blocks away from spawn, which leaves the whole spawn area empty and boring.

Is there a way I can prevent this from happening?
I tried putting spawners around, which kinda worked, but there were lots of mobs who spawned in water(with random spawns I can make them stop spawning in water).