If you would like to improve drawing capabilities you have a few options:
Use a mouse instead of the trackpad on your computer
If you already have an iPad/tablet you can use this as a secondary device for drawing. Just join the same Room link and choose to Join Without Voice.
invest in a drawing tablet - you can buy them at a very reasonable price! You can read more info about them here: https://about.bramble.io/blog/best-drawing-tablet-for-online-tutoring.html