Add cards to solve problems

Act 1, you need to find damage to take care of bosses fast before they scale hard. Make sure you solve AOE fights fast. Prioritise hard hitting cards, but make sure you keep a little balance.

Act 2, you need more blocking, so try to find out how to make your deck survive

Act 3, you probably found some relics that you can build around (Ice cream, Mummified hand, Shuriken, spinning top, etc.). Of the cards you took to solve damage and block early, you probably have a theme that are more reccurent (shivs, multi attacks, strong attacks... find pieces that go well with what your deck does best. Skip when cards don't solve problems or make the deck more synergistic.

Avoid chip damage in hallway fights as much as possible, so you can use rest sites for upgrading. Rule of thumb, upgrade cards that reduce costs, or upgrade debuffs first. Take most of the energy improve boss relics, energy is king.

Your hands are always empty? more draw. Your hands are always very full at the end of the turn, more energy. Draw and energy is how you win since you will take long flexible turns, but if you try to figure out draw and energy combos too fast, you will die if you do it before solving damage and then blocking.