Testing for total t needs to be done fasted and the best time to be tested is between 8-10 am and one should be tested at least twice on different days as endogenous (natural) testosterone levels of a healthy young male rise (peak) in the early morning and are elevated throughout the day and than slowly lower (trough) in the late afternoon/early evening due to the natural (24 hr) circadian rhythm.
You stated your total t 1 year earlier was in the low 500s and it was having labs done past noon. Not sure if you had it tested more than once.
The only symptom you mentioned was suffering low libido. How did you feel overall aside from having a low sex drive regarding energy/mood/erectile function/body composition changes?
You stated that your thyroid test came back low? A dysfunctional thyroid gland can effect libido negatively among many other things and mimic the symptoms of low t.
I think you should have looked into things deeper before jumping on trt, but you are already on now.
Do you have more complete lab work pre-trt/post trt?
Overall one would want to look total t, free t, estradiol (sensitive assay), shbg, dht, prolactin, dhea, LH/FSH, vitamin D, full thyroid panel, cbc (complete blood count) which would include hemoglobin/hematocrit (critical markers) and other health markers to get an overall look at many factors which can effect ones hormonal and body chemistry.
Post trt labs as FeelingLost stated your e2 is high (but looks to be the wrong e2 test?) and your prolactin is high which can lower ones libido among causing other negative issues.