Increasing prices after you have the buy box – private label

Question about price increase frequency.

I got the buy box on my listing the price is $6.99

I want to increase it but how should I go about that?

10% every 3 to 4 days?

I own the private label and I’m the only seller.

It must be the price history that’s stops me from having the buy box at higher prices.

(Not sure I can put the product link here if I can i will)

Any thoughts??