I don’t think low T would contribute to thinning. Though, low T itself isn’t good, regardless of age. It’s like balding. Is balding okay just because you’re 50? Now, I think its a good idea to try and raise your T naturally via exercise and diet and get retested. If you’re consistently in the 400s. You may want to consider TRT.
As for hair loss, I honestly don’t see any hair loss at all. The meds are definitely working, you might be experiencing a seasonal shed.