EAT MORE. Just make sure what you eat has fewer calories. Veggies and meat/fish, less bread/carbs. Don't drink your calories, stick with water black coffee or tea.

Another weird tip, be slightly cold. Your body will burn more calories to warm itself.[1]

I got downvoted, so here's a reference: [1] https://www.theatlantic.com/health/archive/2014/02/how-being...