Just my opinion and many others here are way more knowledgeable then I am (so take their advice over mine).
First, you did everything right for starting out, good job.
Question one: how is your EQ?
This is a very important question because it is your body’s way of letting you know if you are overtraining.
Like you, I was a slow starter. I logged ~500 hours in an extender with zero results.
I just needed something to start, then I knew I would be all set. But how to get it started?
For me, it took a forced break of 10 days with no PE. When I came back, I had six great weeks with results then was able to alter my routine to keep results coming.
Back to you, if your EQ is good then you have to alter something to allow the body to generate growth. This may be adding a couple of grams of arginine (for a NO kick to your system) to your diet. It may be adding some weight lifting (increases growth horemones) to allow the chemicals to be more abundant in your blood to generate growth.
Those would be my first two recommendations. The third would be adding a Bathmate a couple days a week.
It all starts with EQ, this is how your body gives you feedback so you can make the correct adjustments to see results.
Good luck and don’t get discouraged, it will happen.