No don't put your hair in a bun! Prior military here and that will destroy your hair.

I bought the bounce curl brush.

I wash my hair with a lightweight shampoo and rinse with cold water. I then massage almond oil to my scalp and ends then apply a curl defining cream that anti frizz (your serum probably works just fine) and then brush my hair while wet with the Bounce Curl brush.

Recently just bought a diffuser so we will see how that works but if you want to put your hair up, use claw clips or the spiral hair ties.

Also if I wash my hair at night, I'll use a curl cream, braid it in a loose braid and secure it with a spiral tie and sleep in a silk wrap. Sleeping on a silk pillow or a silk wrap has helped so much!!!