I'd be more worried about my melatonin receptors and the withdrawal from Agomelatine when it occurs, more than your 5-HT2C receptors.
I don't know how much you've looked into it, or how much you care about pharmaceutical companies and what you're putting in your body but Servier are the company who make it and they sold the rights to Novartis for the US market but they dropped it due to the lack of evidence for it's efficiency, as well as it's toxicity (watch out for your liver son)
It has a short half-life, so you could take it twice a day if you wanted. That's assuming you're prescribed 100mg and not 50mg. The usual therapeutic range is from 30-60mg as far as I can tell.
Spacing out how often you take it won't speed up downregulation.
Even when downregulation occurs, it's not like you'll magically feel good.
You can mix Agomelatine with other drugs as there isn't any risk for serotonin syndrome, but if you're just starting on the Agomelatine it would be counterproductive to add another drug as you wouldn't know which one is doing what.
Here's a dose of skepticism, should you want it.
Best of luck.
Can I suggest looking into RIMA's (reversible MAO-A inhibitors)
I'm currently on Mocblobemide, after trying some SSRI's and an SNRI.
My psych tried to put me on Agomelatine, but I declined.
He gave me the options of roboxetine, mirtazapine, and this (moclobemide)
The mirtazapine seems like a good back up if this doesn't work, assuming I can't cosy him into prescribing some Tranylcypromine
and I restrain from telling him I'll kill myself and it's his negligence to give me some dexies is the reason I ain't there for the next session
fuck psychiatry is tricky shit OP
good luck