I think this approach is fine. I must say having been doing this for years, treating hundreds and thousands of men I have been underwhelmed with the results with topicals. Injections can cause peaks and valley and I have many younger men inject twice a week that smooths out the peaks and valleys. I think it is appropriate to follow the advice of your primary doctor and endocrinologist. I have just seen too many men spend months or years with gels with sub optimal results. Many men are diagnosed with depression and are not really depressed (I have no idea if this applies to you), but the presumed depression is base dupon low T.
My recommendation would be to pursue this but if a few months pass and results are modest consider another approach. Pellets are one approach to have smooth levels of T and are placed every 4 months.
In addition to this function of testosterone supplements, expect that you will also have better endurance, leaner muscles, improved sexual performance and vigor. This will surely add vitality to your life as you want to, right where you want it. To be able to get all these benefits, better check on each facet of the supplement you want to order. You have to be certain you get ultimate results. Even if results may vary from one person to another, you can be assured that you will be able to see outcomes accordingly as long as the product is efficient enough.