That’s a perfectly reasonable place to be in There’s not a right or wrong answer per se. But the heroes you list present some real tradeoffs in where they work best, so if there were some facet in particular that you were more focused on, it would color my advice.
- Li Xiu will give you much less damage output than Wu Kong.
Her real strength is her AOE mana cut, which is great for delaying enemy specials. She really shines on defense as a tank or flank, where her mana cut can really hurt an enemy trying to build up specials.
- Triton is one of the hardest-hitting 4* in the game, and has a special that is most useful for PvE content.
He really suffers in situations where he can’t be coordinated time-wise with healing. I wouldn’t use him in a defense team because of this. But he’s great for tough titans or seasonal/event bosses.
- Melendor is fragile as a healer, but his tile damage is great, and his dispel is very useful
That said, though, BT is markedly more survivable than Melendor. His special is also harder for the enemy to work around. An enemy can delay activating buffs if Melendor is about to fire. But it’s much harder to manage around BT’s buff. So BT is a much better defense team member than Melendor. I much prefer Melendor on offense than on defense.
- Boril is incredibly useful for Seasonal/Event content
Many sasonal and event bosses use AOE damage. Activate Perfect Riposte at the right time, and you’ll wreck an AOE damage dealer. Boril is good for defense at your level, but starts to suffer as you move up in raid/war difficulty because eventually, everyone has a dispeller that they can use to counter him.
So my advice is this:
For your blues, level Boril, then Triton. Boril will be more useful to you right now, while Triton will start to shine a bit later.
Wu Kong for offense teams and titans over Li Xiu. He may be random, but he’ll far outstrip Li Xiu in terms if damage.
Defense team goal: BT-Li Xiu-Boril-Sartana-Azlar. This places your reds as far apart and as shielded from tiles as possible. The strong coor against Boril is also weak against them, giving attackers a really tough dilemma as to how to stack. Your front 3 are a strong team of delaying the enemy and punishing them for hitting you with tiles.
Gloves go to Li Xiu
Detailed offense advice is probably a bridge too far here.