Legendary

 or  you can replace Trident with Savage or Gungnir. See which one is better for you.

 

Rings

  or  In case you can't acquire the Bloodstone ring, the Sling Ring(Physical) is a viable alternative. If both are unavailable, any ring featuring Fighting and Critical Damage/Critical Hit stats will suffice.

  An easier-to-acquire option would be the Industry City Signet(Physical).

 

Uru-Forged

  I recommend the Uru-Forged Battle Breastplate if you need extra durability to stay alive in tougher content.

  You can swap God of Mischief for Power of Doop if you want to test the damage. See which one fits your playstyle better.

 

Medal

  If you want more base Fighting stats, you can use the S.H.I.E.L.D. Medal instead of the Man-Ape Medal.

 A good medal option would be the Doctor Doom Medallion. It offers extra Spirit, Health, and Damage Rating; test it out and see if you enjoy playing with it. There's also a chance to trigger Cower on enemies, which can be very helpful.

 

Slot 4 

 You can swap to Batroc's Boots if you'd like 

 

Artifact

    For increased survival, choose the Health and Defense cosmic buffs on your artifact, replacing the cost reduction with +2000 Health.

 If you want more damage for your summons, you can replace Siege's Targeting with Encephalo

 Another great alternative for a summoner build is the Sharabus Neotum (Physical) artifact.

 

Team-Up

  If you don't have Coulson, you can use Falcon; the idea is to use their critical passive.

  If you want to survive, Groot is a viable Option.

 And if you want HP sustain, Carnage is an option.

 Magik for more summon damage.

 

Coulson

  You can use Coulson either as an active team-up or just for his passive; remember the equipped items and the benefits that will be applied. If you want a team-up that is always by your side, I recommend it   Deadpool.

 

Insignias 

   For the insignia bonuses, if you can't get Fighting, then Critical Hit, Critical Damage, or Brutal are excellent options—especially Critical Hit and Damage.

The Thor insignia is a good option for damage. 

The Eric O'Grady insignia is a good option because it increases Damage Rating.

If you're looking for a more balanced choice, the Captain America insignia covers that.