TSH HORMONE LEVELS

Hi Dr.Q, My RE checked my thyroid levels and they came back 2.8. I know that it is within normal levels, but about ten years ago it was .7 and just a few years ago it was 1.7; so my question is as i get older(37) is my thyroid going to keep climbing and is that just normal? Are there natural alternatives to help increase its ability to work properly? I already workout and are a healthy weight, i eat well too. thank you so much for your time.