What lifestyle choices have you made that most effectively helped your thyroid

Hello my thyroid has gotten worse over the span of 4-5 years, I got diagnosed at 15 and was given 25mcgs of levothyroxine. I have been getting tested every 3 months to monitor it since was still pretty young. Now I’m 19 and taking 75mcgs and very scared of it getting worse to the point of no return. I’m hoping to get referred to a specialist soon and looking for lifestyle changes in the meantime. I was wondering was has impacted you guys the most and maybe even things that haven’t as I experiment what works for me. Even small or unusual things would be helpful thanks!