I don't really know about prices in your country, but I don't think a r5 5600 with a 6700xt will be enough for 1400p at 360hz in valorant, and don't even think about AAA games at that high of a refresh rate (although 1440p 60hz-144hz at medium settings may work enough).
The 7900xt is not a 20% performance improve, it's much more than that (the 6700xt is a mid range card while the 7900xt is high end). if you plan on using a 6700xt with your cpu I don't really know if it is gonna reach 360hz at 1440p in valorant and you may need to improve your CPU or get a 240hz monitor
TLDR: you have a mid - low high end pc, you can play at 1440p but don't expect to get really high fps on AAA games at really high settings, valorant will work but you may need to upgrade your r5 5600 to get 360hz at 1440p. If you really want to play AAA games at high refresh rate with a 1440p monitor the 7900xt r7 9800x3d is a really good combo