The question is a bit confusing.
However, optimal levels, the term can also be misleading. You can say their are optimal averages or averages that are optimal but that doesn't mean everyone falls into that category.
That said:
Optimal Total Testosterone is 700-1100 ng/dl
Optimal Free Testosterone is 20-30 pg/ml
This is using the LabCorp numbers and it's important to state that because for reasons that make very little sense, not all labs hold to the same when going by units of measurement. For example, notice that pg/ml at Quest will reflect a very different number when compared to pg/ml at LabCorp. This is a very annoying problem when it comes to measuring testosterone.

All of that said - a lot of men always ask to be at the top of the optimal range, but when it comes to TRT the goal is symptomatic relief, that's first and foremost. I've seen plenty of guys that feel great with total testosterone around 600 ng/dl and plenty that feel fantastic with free testosterone around 18 pg/ml and when their levels go higher, they feel worse. And it may not be a worse feeling because of the higher testosterone but rather the balance between all hormones. Of course, it goes without saying some will need to be near or even a little over the average optimal range. In the end there are only a few things that matter:

1. Are you symptom free?
2. Is your blood thickness in good shape?
3. Is your prostate in good shape?
4. Are you showing any cardiovascular risks since being on TRT?

If you can answer all these questions as follows:
1. Yes
2. Yes
3. Yes
4. No
Then things are going right and what the actual testosterone numbers say is relatively meaningless.