how can I make a cooking beef roast tender

Cut of meat determines cooking time.

Usually time; specifically a slightly lower temp for a longer time.
You can also get a 'needle tenderizer' which helps with tougher cuts of meat.
I like mine as it can turn a lower grade roast into a very tender thing.
https://www.amazon.com/TrendZ-Branded-Needle-Meat-Tenderizer/dp/B002TOKH3K

What cut are you preparing?