If you give a course in a classroom, you reach 10 people (the others were sleeping).
If you make a perfect course online, and answer questions online, you reach 10 thousand.
Not doing things online is a waste of time.
You are a highly trained professional, and your time is extremely valuable.
Even if it takes twice as long to create the material than giving course, you are still more efficient by a factor of 500.
It is as if there were 500 little copies of you working full time. It is a superpower.