You can still level Tiburtus as he is a great attacker but I suggest you to park Elkanen and Hu Tao.
For a general purpose team you should seek a mix of survivability and offense, Boldtusk and Wilbur will bring you both. Kiril is a good hero but his buff will have some conflicts with Wilberu’s (DEF) and Boldtusk’s (ATK) buff. You can still use Kiril with one of them (two would maybe be too much) by activing Kiril before the others and doing so keeping the best effects.
For general usage you could achieve the best results with AoE attackers as Little John and Hu Tao (even if he isn’t a great damager) but for a raid perspective faster and sturdier heroes are better.
A good team of 3.60 heroes could make you complete the story mode, Wilbur would help you greatly in that regard.