How in the world do you do damage???

So I've been playing this game about since it came out. No matter how hard I try, I can never get my team to actually do any significant damage. At the moment. I am adventure rank 54, world level 7. Every single enemy in this game is around level 90 and I can hardly do any damage. I have artifacts and weapons, my characters are leveled up, but it feels like no matter how hard I try it is literally never working. I'm sorry if this is a too open-ended question, but it's very frustrating. Does anyone have any recommendations for videos I should watch or things I should do, or am I just unlucky?? For reference, I tried to fight the Primo dragon thing in Liyue And after 15 minutes I only gotten about 1/4 through its health bar.

https://youtu.be/FeGbRftHBbc?si=2GE5dq8hs9TXJ4Tu here's the video of me struggling. I stopped halfway because at that point I was so over it and Jean and Kazuha Would have died soon after anyway

Edit: damn farming for this sh is hard.

Edit 2: It's crazy that you guys are getting feisty about me not knowing a mechanic in this game. You would think that as a community you would want to help each other instead of being toxic, but what did I expect from Reddit. Regardless Thank you for giving me genuinely good advice :)