Just so let you guys know...... I've swapped out my Prototype to One Shot(Maxed, but I have horrible aim with snipers so I normally use other guns) and my Dark Matter Generator to Adamant Bomber.
Against people with jetpack, I normally use Dual Cryo Pistols, which distract and force the target to move around, which significantly reduces their fire accuracy. When they come close, I use my Minigun Shotgun or Combat Yo-Yo to take them down.
In corridors or on top of the roop, I use my Adamant Bomber to take down other players, which apparantly with Adamant Bomber, is easy to do(unlike with Toy Bomber which I used in my Second Account).
When there are lots of enemy players in the building, I charge to those guys and use my Combat Yo-Yo to cause some massacre(I sometimes get Slaughter with Combat Yo-Yo) However, when the ememy players are armed with GL series or Nanobot Rifle, I just use Adamant Bomber(or Deadly Beat) to take multiples of them with few shots.
I haven't got lots of gadgets, so I use Molotov Cocktail(which I am planning to swap to Singular Grenade when I obtain it), Jetpack(just like every average players that use Adamant Bomber) and Heal Pack(haven't got Resurrection yet, so I am just using Alternative instead of it)
Little Cthulhu, apparantly, proved itself to be really powerful in the Pool Party. That thing kills players(maxed) with TWO shot. My current strategy in the Pool Party is sniping people in/outside the pool building with Little Cthulhu and spamming some Adamant Bomber to annoy them/kill them. In close-ranged battles, I use Undertaker or Combat Yo-Yo, since those two weapons are the strongest weapon in close-ranged battles. Lastly, I use Dual Cryo Pistols(which I maxed out a few days ago) to take down jetpack users.
That Strategy apparantly helped me achieve lvl 30 in my third account, and I suggest others which have not-so-good-aim-with-scoped-snipers to also try out Little Cthulhu in the Pool Party map.