18Y/O on TRT. Brain Fog, Low Libido, Fatigue. Could Use Some Help

I received my Thyroid labwork test results today.
TSH - 4.460 uIU/mL 0.450-4.500
T4 - 6.6 ug/dL 4.5-12.0
fT4 - 1.21 ng/dL 0.93-1.60
fT3 - 3.4 pg/mL 2.3-5.0
I’ve read that ideal TSH is around/closer to 1, and that fT3 is the only active hormone and should be upper/mid range. With a high TSH like I have, I think this might be hypothyroidism. Does anyone have any advice on how I could achieve better numbers to see if that fixes these symptoms? My symptoms are brain fog (especially forgetfulness), fatigue, low libido/frequent ED, and irritability.

I usually eat out, so I’m not sure my iodized salt intake in the past, however a few weeks ago when I first suspected thyroid problems, I began a daily thyroid support supplement containing Iodine, Selenium, Copper, and manganese. I haven’t noticed any improvements in symptoms, if anything, they may have gotten worse.