i want to be able to play newer games on my laptop but i do not have a thunderbolt 3 on my current laptop. so i was wondering if i could just run a thunderbolt 3 to a usb type a converter
No because usb does not have pcie protocols. Tb3 is not the only port with pcie. Every laptop with wifi has a slot, either mpcie or m.2, that the wifi card is in. There's also expresscard but that's on older laptops and also the older versions of tb.