I have an alternative for B2B that worked not too bad for me as a typical introvert sales-averse SE: working a few years in customer support, pre-sales and solution engineer, ideally all three at the same time (in B2B obv.). Then you’ll hopefully have a good grasp of the sales process, how to make a good demo, how is organized the typical medium big company, which will help both close deal and build relevant features by talking to the relevant persons.

Then by knowing both how to build software, how works a typical company and how to sell, I was ready when an opportunity showed up.