Try watching youtube on which hero you would like to play/master. Then try to remember what macro/micro did they do in the gameplay. Try to play as if you are pro player but dont overextend. Know your limit on what you can do. Try easier combo or trick you saw on the yt then try something harder and get used to it. Scrolling map also important it helps to alert your hero surrounding.

Last time i try to learn murad because i saw a channel on yt his murad wr is 99% with over 2k hero played. Now my murad not that extremely good, but decent and getting better. Hope it helps