Your GPU is fine, Valorant is a CPU intensive game, I recommend spending the majority of the money on a good AMD CPU, but make sure it's compatible with your motherboard (if not, allocate enough money to buying a motherboard thats compatible with it)
Also 16 gigs of ram is all you need unless you absolutely need to have a second monitor playing skibidi toilet on it
Your monitor is also already good enough. Theres a huge difference between 60 to 144hz but theres barely any difference (enough to give you a competitive advantage at least) between 144 to 260hz