You should be able to start training others to sell. The proof if you are ready is if others learn to sell and make money from your teachings.
It will best if you have taken plenty of time to produce a respectible amount of sales over a good period of time to teach others to do what you do.
And naturally, you would not want to even consider training other people for a sales career, if you have not developed a respectible sales career yourself. Your trainees would not respect your nor learn very much from you anyway.
But, if you have take your time to develop a good sales history, there is no need to stay a single salesforce. You can instead multiply your efforts by taking on students for your methods of sales.
It is important that you continue to improve yourself and how to best teach your salespeople and provide the best techniques and tools for them.
After all, you really are still in sales, and you must continue to improve yourself, because now your sales is selling your salespeople on how to sell.