As you know there is a weekly challenge on the left side of the destination screen, which is currently a hard mode (lvl22) of Cosmodrome Strike mission (for me, I do not know if it's the same for everyone). Though, there is no matchmaking for the event and I, alone, am not powerful enough to do a lvl 22 Strike on my own. What are my options, except for leveling up, which I am trying at the moment, or inviting random people to join my fireteam, which has been a failure so far.
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look for level 22 people in the tower and send them invites