Nice start but you need a lot more plants to break up line of sight and give weaker fish some place to hide, With a sorority I suggest you get as many plants as you can and put them in all at once the less you rearrange the tank the Betta, There is a hierarchy in a sorority and each time you change something around it can upset it causing fish to chase each other and try climb the social ladder so the speak.
A few floating plants wont go astray also.
If you want have a look at my sorority
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