5 mouths in and only 4kg down

I started in July this year and 5 months in I’ve only lost 4kg down. I’m currently on 0.5 a week, eating twice a day most days and in a job that requires me to be on my feet / walking all day. I started at 100kg and only on 96kg. I’m losing motivation and feel like giving up 😢 my doctor keeps pushing me towards the gastric sleeve surgery and it’s just not something I’m willing to do. I’m in my mid 20s and I don’t want invasive surgery before giving it my all. Has anyone had a similar experience? Any advice? I had a healthy weight most of my life this weight gain (30kg) has happened very quickly in the last 2.5 years.