Ryzen? That is a CPU.
If you want more GPU performance, now isn't exactly the time. Anything faster than GTX1660Ti is going to cost you upwards of $500-2000 US.
The laptop doesn't have a thunderbolt port, so that rules out off the shelf external GPU enclosures.
Does have a lot of M.2 ports, so you could conceivably install a GPU with an adapter and ribbon cable, but this is not likely to rival the performance of the 1660Ti no matter what GPU you use. Would also make the system non-portable.
Best advice would be to find a laptop with the GPU you want, and sell yours. Again, GPUs are in short supply, so finding a high end laptop is going to be practically impossible.