Now, what ever you aspire to, you are in the focus of businesses yourself allready. There are authors to put up their books for sale and coaches as well as trainers to offer their generous help. So, you might want to check out some links – just to learn from them. Some others have been mentioned here somewhere before.
Here is Tanja Gardner who claims to be capable of telling you as an introvert how to promote yourself and/or your offerings online easily and authentically, without the energy drain and in your own time: http://crystalclaritycopywriting.com/introvert-home-study-signup.html
And then have a look at Julia Barnickle’s „quiet entrepreneur“ presenting mindset and marketing for introverts in business by focussing on „Ryan’s Roles“ – whoever Ryan is. You’ll find out and give me your opinion, if you like: http://thequietentrepreneur.com/7690/introvert-business-models-for-on-line-success/