Are you a bot? Your old 300lb body was telling you something about your health. Here’s the truth. Don’t follow any recommendations for health and fitness. There, you will gain the weight back exponentially. The next time you try to be healthy again, it will be near impossible, even with surgery and medication.
I thought you wanted a child? Isn’t modeling for that child healthy habits good parenting? You can do hard things. Ask for a therapist, dietitian, medical reports, take child care classes, marriage counseling, run away from abuse, get post partum care. Do it for your kid if you won’t do it for yourself.