Lung nodules from thyroid cancer found 4 years after thyroidectomy

Hello,
I had a thyroidectomy 4 years ago with multiple lymph nodes also removed back in 2021. My endocrinologist had me do a PET scan due to my thyroglobulin levels being "high"; the results showed lunge nodules that both the endocrinologist and pulminologist could not identify. I was referred out to endocrinologist oncologist who reviewed my medical history and told me the lung nodules are thyroid cancer that was probably there from the beginning (2021), however was not caught because the imaging done back then was always of my neck. I had the iodine ablation post-surgery and then two more rounds of low-grade iodine radiation, with clear results coming back each time with the whole body scans. The PET scan (2024) is where the lung nodules were found.
My TSH is low (0.2) ad thyroglobulin is 7.9 - oncology has taken over my care (previous endocrinologist did not specialize in thyroid cancer, thus the referral) and is monitoring my thyroid labs and continuing with TSH suppression. He told me that given the presence of the lung nodules, this will everntually be treated further down the road with either chemo pill or "whatever treatment has been developed at that time".
I gues this is a long-winded way of asking, can anyone give insight on what is going on? I feel like I was told there is still thyroid cancer in my body but nothing is to be done until it is more advanced. Basically I was told that as long as I am not in pain, suddenly lose weight, or have new symptoms, I am to go about as normal...it all feels a bit hazy and confusing.