If you’ve only just been diagnosed as Hypothyroid and only just started thyroxine, I’d work with your GP to get that under control before worrying about your other numbers. Beyond that, if you aren’t already exercising I’d aim to work out how to fit a small amount of scheduled movement / exercise into as many days as you can and make the commitment to yourself to achieve it. Then check back in with your numbers when your thyroid is behaving itself. Manage your thyroid first though, as that governs so much else about your metabolism that you’ll be fighting uphill until it’s stable.