Hello guys! So, I'd like to ask for some advise, I'm planning to upgrade my current setup, I'm a casual gamer and use it mostly for school, so, it's nothing fancy, but yeah, not the best either, I'd like some suggestions with an Intel CPU in case you think I should ditch the current:

Motherboard: ASUS H81M-A
Processor: i5 4570 @ 3.20
PSU: 550W
RAM: 10GB (2 8 DDR3) Not so sure about the frequency.
Graphics card: I don't have at the moment, I'm using the integrated graphics (Intel HD Graphics 6000)
Windows 10 64-bit.

So, I'm not sure if I should upgrade the CPU, motherboard, PSU (get a certificated one) and/or RAM to something newer, or just buy a GPU, not looking for something too expensive, because of budget, maybe spend $250-$350 USD for now.

I've been looking for a dedicated graphics card and right now in my country, 1650 super are around $250-$300, 1660 super from $300-350 USD, with that in mind it's kinda tricky for me to know what's better (upgrade some components and stay with integrated or just buy a graphics card right away)
Also, wanted to ask if a RX6600 would be a nice option with my current setup?

I don't mind playing at 720 or 1080p, just looking for somwthing good enough to play some GTA V, Tomb Raider, maybe Forza Horizon, Genshin, Yakuza, use some Photoshop.
I know it may be a bit complicated due to my budget limitation, but I'm open to suggestions, any advise will be useful and if you have any questions, please, let me know.