Endgame can be stressful with randoms, so try to find a good solid group of people who you can learn content together with and bond with over mistakes who aren't uber critical elites.

Commendations are also a joke, do not even for one second believe they are a valid judgement of your performance in a group. They are more like weird random gifts from strangers. I saved our group from 3 possible wipes in one run of Alexander last night when my friend who was cohealing with me started getting massive lag spikes and died three times in aoe, while managing the party while he was dead, the prey and bleeding debuffs and rezzing the friggin bard who kept dying over and over from not dodging aoe sitting in wanderers minuet (who got loot btw, rng consistently smiles on the worst party members). All that and no comms. You could be superman incarnate and still not get recognized for it, so be surprised when you get them but don't expect them.