How to become "stronger"

Hello, i'am a mastery seven Harrow main and iam currently doing quite terrible.

I have been doing well but iam currently stuck at Aten. Whenever i start the mission i immediatly get bulldozed. Iam not sure wheter its my build or my weapons but i feel like i cant complete any mission on my own. What can i do to well become stronger

submitted by /u/DrNewname
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source https://www.reddit.com/r/Warframe/comments/11b3aqm/how_to_become_stronger/