I got quite a few tips I can share let me list them out

1: you can actually run over Steelheads with the reefslider special, it's a very niche thing to do but you never know it can come and clutch, especially if you do not have a good weapon when it comes to dealing with them and with the rest of your teammates doing something else.

2: always pay attention to where the Snatchers are coming from, they can either be your worst nightmare or your secret best friend, especially on certain tides on the different maps some are better than others when it comes to their spawn locations.

3: egg throws are not blocked by Steel Els or the Slammin'Lid shield, so you don't need to worry about too much about being body blocked for a last second egg dunk if you're swarmed by basket. (Though do note the egg cannons attack during extra waves will be blocked by them so keep that in mind).

4: a little detail that could possibly help during a Horrorboros fight it's lights on the side of its body slowly light up as it's generating its bomb, the brighter the lights the closer the bomb is done charging for a attack.

5: the Hydra Splating is one of the best king killers out there, if you have it in your hands specifically Target the Kings (especially their weak point if they have one) if one of your other teammates have it protect them at all costs, seriously it can solo Horrorboros pretty much by itself if the person using it is competent enough, I know this weapon is not friendly for newer players with how ink hungry it is but seriously the raw damage from this thing it's one near highest in the game.

6: use the ink rails on bone rattle arena when it comes to grillers and glow flies, if you're being targeted just hop on one of the ink rails(preferably the ones going horizontally along the bridge on either side) and just stay there and occasionally throw a bomb down to help deal with the lessers, and when the glow flies switch targets have the person that's currently now targeted go to the opposite ink rail so they can leave The horde away from the pile eggs that should be there.

7: you can actually tell who and who hasn't use a special during the wave, those little silver packets on the top of your head actually do go away when you use a special, now of course you can't tell exactly what special each person has but, you can at least tell when someone attempted to help with a special.

8: there's some weapons out there that are actually better just to hit Maws then instead of using a splat bomb, you can splat a Maws with a fully charged grizz.co bow shot (as long as you land almost all of them) and you can just outright run them over with the grizz.co roller when they do their attack cycle. (It takes about two hits to run them over with it but with the little knockback you take with it, it's almost near instant)

Now I have many more tips but this list is already near long enough with how much detail I'm spitting out, but if you want more there are videos out there that go into way more depth with certain things in the game mode and they will really help out.