AAS use can have a direct influence on neurotransmitters, they even influence neurons in your brains at those dosages .
Accepting to continues at a lower dose is a process .Takes time Being on for 10 year will take a while to normalize, its like being fat all you life, sure you can lose the fat and get fit, but it will take time.
"Neuroplasticity" fortunately is The brain's ability to reorganize itself by forming new neural connections throughout life."
Neuroplasticity allows the neurons (nerve cells) in the brain to compensate for injury and disease and to adjust their activities in response to new situations or to changes in their environment.
But it takes time and commitment, the longer you have been on the longer it will take to adapt.
The first thing I would consider is not being too concerned with traditional TRT prescribed doses. Not now-you need to start with the minimum dose that makes you feel well... "alright" and design yourself a protocol that you can stick to tapering down you dosage to where you want to be.
This will creat the correct chemical environment for your body/brain to keep all its functions as you taper your dose. the presence of the brain chemicals are part of speeding your recovery.
SSRI's can be part of the healing process, they have a role in the MECHANICAL process as well. You may consider NSRI's or tri-cyclics or other better suited chemicals (potential for abuse) that will speed up you healing process.
It will take time, and efforts but just like you took your time building your body, take you time getting it to function again.
At no time should you despair.
Make your plan, and stick to it. Its like a contest prep backwards under harder circumstances. The more committed you are to put this behind you- the quicker the process. Flinch, and you will stumble.
STICK TO THE PLAN and at no time second guess yourself .This is uncharted territory but you know enough to pull yourself through.
Good luck to you this is a challenge but you can do it.