Maybe I can not understand what you wrote above (i am little in english), but if you talk about regeneration serotonine, you should do process of upregulation receptors SER. Let's assume that MDMA works on 5-HT2A receptor serotonin and causes downregulation and flushesh SER. So, i think, that we should take antagonist receptors 5-HT2A such as trasodon, mitrazapine, klozapine, olanzapine, kwetiapine, risperidon, hydroxyzine ofc in little dosage. So as to desensitize receptors. No high dosage becouse we dont want neuroleptic effect. Its my private opinion, but i might be wrong.
itthats mean:
Downregulation - reduction of mRNA expression carrying genetic information about a given receptor -> decrease in packing density, and thus also decrease in receptor copy pool -> inhibited conductivity.
Upregulation - increased expression of mRNA carrying genetic information about a given receptor -> increased packing density, and thus also increased receptor copy pool -> increased conductivity.
btw.
The way to complete serotonine in human body its very simple. Take 5-HTP with EGCG (from green tea or suppl). But it's not good way. Or It's not good way for a longtime (destructive for neurotrasmittering). Better make upregulation.