Welcome to NeuroTalk.
Your supplements so far are good choices. I have to wonder though, if you are having problems with serotonin manufacture.
Magnesium and B6 are cofactors in synthesis with tryptophan.
The 5-HTP is an intermediate step to serotonin.
Therefore I'd suggest a good B-complex to provide B6.
You can do a B50, or B-right by Jarrow if you don't like the high doses.
Another factor especially if you have sleep issues, is B12. The activated form, is a cofactor in melatonin synthesis, and may help
1000mcg (1mg) of methylcobalamin daily on an empty stomach.
The form in multivitamins or B-complex is usually cyano form and some people cannot activate it to methylB12 properly, so are functionally low.
It appears to me though, that you are on the right track.
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All truths are easy to understand once they are discovered; the point is to discover them.-- Galileo Galilei
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Weezie looking at petunias 8.25.2017
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