Doctor Doom, Photon, Archangel (try and awaken him with an awakening gem), Hulkling (try and awaken him and us sig stones on him as well), Iron Man, Corvus Glaive, Omega Sentinel, Nightcrawler, Captain Marvel, and King Groot are all great and will help you for different reasons.
6*s have become more commonly available now with 7*s out. I would focus on Black Widow Clairvoyant and Photon first. They are fine unawakened and very versatile attackers to help in quests.
You need some other diversity to inprove your roster: 1. Archangel: awaken him first 2. Hulkling 3. Warlock 4. Doom 5. Spider Ham
That is a pretty good team to work with as your core. You are missing a skill attacker and if you dont get one or get stuck, then Black Panther and Attuma can be considered. Black Panther will get outdated quite fast when you get better slill champs and Attuma will mostly be used on defense, so it is up to you.
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You need some other diversity to inprove your roster:
1. Archangel: awaken him first
2. Hulkling
3. Warlock
4. Doom
5. Spider Ham
That is a pretty good team to work with as your core. You are missing a skill attacker and if you dont get one or get stuck, then Black Panther and Attuma can be considered. Black Panther will get outdated quite fast when you get better slill champs and Attuma will mostly be used on defense, so it is up to you.