How to wean from breastfeeding?

I have breastfed for 3 years in a row now. I would like to wean my last child, so I can focus on myself and lose weight. She is only six months old, but I really want my body back. Do I have to wean? If I try losing weight, will it mess with my supply? If I wean her, what formula would be best?

I don’t blame you for wanting your body back mama <3