Tips to increase follow back percentage

Follow accounts that comment on a photo uploaded by a user in your nice
Follow public accounts
Follow in the morning time
Have a good profile pic and bio
Dont rush follow a lot of people, wait in between follows
Like 1 or 2 of their pics

The best once I have noticed (have your account on private)

is there anything Im missing?

You get higher followback by keeping the acc private?

I have seen a few clients that I have say they get good followbacks when they are private. My thoughts are because people are curious to see thier page and only can see it by following. Works very well with an atractive female.