compatibility between cpu and gpu

What's the best GPU for 3400G considering no budget limit or bottleneck? I've read a lot of posts stating 1660 Super/2060 Super is the best it can get that I can buy online. I'd like to support a local store but they only have 1660 TI. I'm also not sure if there needs to be some kind of...

Hello I know some of you might be asking to upgrade to a much more powerful CPU and get a decent GPU but my friend's financial situation is not really that great so he has to play with a crappy GPU AMD HD5450 and he wants an upgrade so he can run Valorant on a stable fps and I just wanna ask if...