A battery won't get better by providing energy to some device. It gets drained. Similarly, introverts get drained by human interaction, so they need to recharge by staying alone. Extroverts on the other hand get drained by being alone and recharge in company of other humans. Telling an extrovert to not socialize with anyone for a year to get better at it is as much nonsense as telling an introvert to go socialize more to get better at it. That's not how it works.

The more human interaction I can avoid, the better, so I'm recharged when I have to interact with people.

A muscle doesn't grow stronger with atrophy... likewise, the mind doesn't grow stronger without challenge.

It's like trying to use a tool all the time expecting it to get better instead of wearing itself out. That's not how this works. No matter how good you get at human interaction it won't change the fact that it will drain you, if you're introverted.