Please read the advice for new guys sticky.
There you will see that inability to absorb transdermal T is a symptom of low thyroid function aka subclinical hypothyroidism. You will also see that you can evaluate your overall thyroid function by checking your oral body temperature.
Transdermals simply do not work for some guys. Having T levels drop can and does happen. Increasing transdermal T dose will not help. You will need to switch to T self-injections. You also need to read up on estrogen management. If you are younger, need to preserve fertility or avoid shrinking testes, you need to inject hCG.
The biggest challenge one has to deal with is finding a doctor who is not an idiot when dealing with men's hormones. You need to understand these things in self defense. There are 7 stickies in total and you man need to read "finding a TRT doc".