For Machine Learning you should have a Nvidia Graphic card which helps a lot. I gain a lot of time during the development process with a multi core CPU. Do you have a good CPU on your AWS online VPS?
95% of my time, I spend for training during the development phase. Actually, developing multi assets, algos and time frames in one script force the system during training a lot. WFA with 10 cycles is a must and should be executed with 10 cores in parallel.

Martin