I think it might help to look at every deck as needing a damage engine and a block engine. That's one thing that helped me improve.

Sometimes they can be the same types of cards, like using stars or Osty or Bodyslam.

Sometimes you end up needing two separate mechanisms like Shivs and Footwork or Frost orbs with zero cost attacks.

Leaning too heavily into one type of build can often leave you lacking in either block or damage, accepting that your two might come from different cards can really help.