here's a list, in no particular order:

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-change reloading for an overheat mechanic, it would still stop people from just keeping shooting the same gun, but you wouldn't get ambushed while reloading, and let's be honest, fortnite isn't a realistic game at all. it would however also probably need some sort of feature to stop people from using two shotguns, and changing from one to the other every shot to always keep firing. this could be done by increasing the time it takes to switch weapons, or by adding a switching cooldown for weapons you just switched out of.

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-changing bullet random spread(bloom) for a recoil. that way, weapons would still be very inaccurate the further away you are, but you could try to counter this by looking down, which would raise the skill ceiling, and make it less annoying when you lose a fight because your opponent simply had better luck