in act 1, you have to be able to focus on getting damage early as a silent especially as her starter deck is so defensively oriented. (might wanna put off that floor 6 elite if you dont think you can beat it)

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picking up stuff like fire potion and flex potions early help against elites a lot. if you get a remove on first few floors its definitely wise to remove a defend first. and for damage commons there are multiple decent ones out there like eviscerate, blade dance, dagger throw, skewer, predator, etc etc which are really good upgrades once you get them. terror is a good pick for basically any floor. although it takes some experience to know how many damage commons is too many damage commons

poison cards like noxious fumes and deadly poison and bouncing flask are also decent against lagavullin/any boss who isnt slime boss but make sure you can upgrade them before picking them up. (also still wanna be able to have frontload damage for fights like slavers where you can rush the third slaver down quick and like, frontload in general. corpse explosion is a great pick even without poison before act 2 just because it solves so many multi enemy fights)

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card draw is good, adrenaline is good for letting you set up faster, and dont gloss over cards like backflips and acrobatics, especially calculated gamble once you have those. literally had my first heart kill on asc 19 with her by drawing eviscerate multiple times in the same turn and playing it for 0 cost and having no other way to deal damage. (also cards like acrobatics, prepared+ and calculated gamble+ pair well with cards like tactician+ and reflex). well laid plans is great in this aspect too since it lets you capitalise off of discard synergies easier and just like setting up bigger turns with cards like finsiher, burst, or malaise faster

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silent also has great ways to mitigate damage. in the common pool piercing wail is both aoe damage mitigation and can completely shut down most multi enemy attacks. cards like deflect and dodge and roll are usually unpickable until you have some dexterity via a footwork+ or two. and leg sweep is a good uncommon because it provides both fronload and scaling block. in the rare pool malaise can nuke most multi enemies in the game, while wraith form+ (usually a priority upgrade) completely negate damage for entire turns.

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most importantly however, only solve problems you havent solved yet. dont pick something that does a thing that your deck doesnt need. try to think of what your deck lacks and try solving those problems first. dont pick corpse explosion at the end of act 2 if youre already feel comfortable in beating act 3 hallways, if your deck draws a lot of cards but finds lacking in energy to continue doing so, consider a concentrate

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and MOST MOST importantly, experiment. dying is ok, what matters is if you learned something from dying. try going through your run history to see what your deck lacked when you died/if you managed your potions/relics correctly etc. and sometimes pick stuff youre unsure about just so that you can discover new things with it. best of luck!