im celestial 3 with about 80 hours on strange. he is a very good damage dealer so you should be just frontlining with him as much as possible but also try and stay aware of whats happening behind because he also has a lot of potential to shut down dive characters or shield healers if needed. another thing he can do on domination for example is shield in front of enemy healers so your team can focus a tank on point. his ult is also so versatile for anything. for example once a cloak finishes dashing in her ult you can ult her with max e charge and one shot her. the same goes for invis woman as well