Improve performance python script

I have python script which takes a lot of ram and which is really slow. It could till 10 days to run the script to the end. I need someone to improve drastically that python project. I need someone with experience in improving code performance. The thing is I am pulling data from polygon.io. So roughly 10000 symbols * 250 trading days * 20 years. It is a lot of data, but it should not take that long