Need help if I should upgrade GPU or just build a new PC

I've got a Ryzen 5 3600, RTX 2070 Super, 16GB 2133mhz DDR4, EVGA G650GQ machine that I want to run VR (Le Mans Ultimate/iRacing and Microsoft Flight Simulator) but I know the GPU is a bottleneck. The motherboard x16 lane is PCIE 4.0 so theoretically I can do it but I'm not sure if I have enough power for that in the PSU (or the right cables) or if the CPU will be a limiting factor. Any advice?