If you can get a AMD 6000 series GPU card would be the best option but the cheaper RX5700XT is comparable or slightly better than the Nvida GTX1070ti as per this GPU Tech site: https://www.gpucheck.com/compare/amd-radeon-rx-5700-xt-vs-nvidia-geforce-gtx-1070-ti/intel-core-i7-8...
The AMD 6000 Series would probably be the best option but they are extremely expensive and hard to get for the time being. So even though this website doesn't recommend to update to the RX5700XT since it is slightly better than the Nvidia GTX1070ti
Or you can purchase a AMD Professional GPU card which are more expensive than AMD Consumer GPU cards but has Drivers made for professional workstation type programs and the GPUs are made for Workstation PC type of environment.