Slay the Spire

I am the worst at this game. I picked it up for Switch right after it came out (I think it was in January) and within the first few days managed to get through act 3 with armor guy and orby. Since then I’ve made about a billion attempts with the silent and I think I’ve only seen the act 3 boss twice. Most runs end by early act 2. Please help I just want to finish this so I can go back to playing the other characters that I like.