the acetic acid can be used to dephosphorylate psilocybin to cationic psilocin (positively charged psilocin), especially when subjected to gentle heating, which is why I suggested the hot water bath. In that charge state, the alkaloid is fairly stable.
It's when you basify it that you want to extract quickly, using dcm, ethyl acetate, or ethyl ether. from that, you may add an acidic alcohol solution. this is A/B/A.
now that I think about it, dcm will mix with the alcohol...you'd have to evaporate the solution.
ethyl ether or ethyl acetate should form layers. collect the bottom layer and freeze precipitate, or evaporate.
this will yield an alkaloid salt. if anyone is successful crystallizing freeform psilocybin, let me know. It's no simple undertaking.
Crystals of the Gods is a bit misleading. it's not as easy as crashing out in ethanol, some partitioning is in order.
this one can be scaled up
https://www.anoniem.org/?https://www.erowid.org/archive/rhodium/chemistry/psilocin.extraction.html
and it cannot be stressed enough, to extract from the basic phase asap, don't let it sit.