Picked this game back up this week thanks to shelter in place, but before I keep firing off at my 2k energy and invest anymore coin/materials to heroes I was wondering if there was any insight as to ideal options (campaign, dungeon, arena etc).

Pretty much pure f2p except the occasional $3 spend when the mini pack comes up.

Heroes I have currently as well as the typical team I've been using as long as I can remember.

4 Stars

Preserver - Ascended

Elhain - Ascended

Warpriest - Ascended

Spirithost - Ascended

Avenger - Ascended

Shaman - 1* Ascended

Sorceress 

Kytis

Knight Errant

3 Stars

Valerie

Hospitaller

Slayer

Heiress

Runic Warder

Ghoulish Ranger

Siegebreaker

Flinger 

Current (Standard Team)

Preserver - Legendary set equipped

Elhain

Warpriest

Spirithost

Shaman (dungeons)