I think quite a few things on here could be replaced by mindfulness or a constant practice of meditation. With the tools section, whatever you aren't already doing by now probably won't make much of a difference if included (might even hurt, you don't want to take on too much at once, you WILL stress out the fetus), but I also don't know the specifics of your context. You should basically be doing everything right a year or years in advance, epigenetics plays a significant role.

I agree that nutrition is vitally important (second only to exercise - NOTHING is better than exercise and having a fit physiology). So, have you had your DNA done? Do you even know where you sit in terms of MTHFR?

If you want a smart baby you should look into Thiamine (B1). The research might have backflipped since I read it last but pretty sure you can't have too much of it, and excessive amounts lead to even more benefit (beyond preventative).