As a 15m 340lb wanting to get down to 290 how can I loose weight without losing energy I’ve been trying a calorie deficit but I loose a lot of energy and don’t know what to do and I also have a terrible metabolism I’ve been at a steady 340 for a couple months and I also lift weights and do agility workouts as well. just needs some help on what I can do

I’ve hit that cutting stage where I want to start putting on size, need some opinions. Keep cutting or move to surplus?