What most naturally follows?

How to make a female betta community
Consider tank volume.
There is no strict minimum volume for a community tank; however, most community tanks that include multiple fish will need to be at least 10 gallons. Anything under 10 gallons will be problematic due to high bioload (the amount of living organisms in your aquarium that make waste).
Make sure you have the space and financial resources to purchase and maintain a tank of this size. In addition to tank volume, make sure you consider a tank with a hood or lid-betta fish are known jumpers! Understand fish " personalities.