Suggest Ways To Lose Weight When Diagnosed With Hypothyroidism

I want to reduce weight quickly. I have hypothyroid and am in Eltroxin 25mcg. I tried everything (diet, gym) to reduce weight but not even 1kg is reducing. I am 4ft11inch and my weight is 66 kg. I am 36years old.

during my first pregnancy, I am diagnosed with hypothyroid. I was 50kgs in 2007 and gained 19kgs during my pregnancy. Since then, I am unable to reduce this 66 kgs.

Can you please advice me some weightloss medicine so that I can shed atleast 10kgs quickly?