To improve your utility, try switching to a complex agent like Viper/Astra/Cypher/Killjoy and seeing how that goes. Pro games can help out with this, think of them as having examples for how you should play (i.e. where to smoke or place cameras/turrets). They can also show you better team compositions, although I am unsure how big of a factor team comps are in silver lol. Boaster from Fnatic has made a few videos on YouTube instructing how to play several different agents on different maps. Regardless, the most important thing would be for you too just play more competitive, practicing more would simply be the best way to improve your game sense. Having bad game sense is very reasonable with how short of a time you have been playing Valorant for.
Your crosshair placement and pre-aiming are perfect, I have no advice to give there. Your aim in general is far better than any silver player I have ever seen. You seem to be very good with headshots so sticking with the Vandal would probably be for the best. You should have a lot of confidence when taking on fights because you can probably out aim anyone on the enemy team. Playing with black bars does shrink the enemies model compared to stretched IIRC, although landing your shots doesn't appear to be an issue at all.
Good luck with improving, although I do doubt you are silver lol