Freebase DMT is practically insoluble in alkaline solutions. What you have is simply freebase DMT oil decant the excess water and evaporate, and you'll likely just find salts and excess sodium carbonate (there's not going to be fumaric acid, as it's been neutralized); 100mL being a hell of a lot of excess water, though, may result in a good deal of freebase particulates floating around, so let them settle first. SWIM would guess that SWIY did this in a beaker or glass of some kind, so it will be difficult to remove and crystallize without aid of a solvent like acetone or IPA which should then be decanted off of the excess sodium carbonate and evaped to retrieve the product.
Next time, try one of these methods:
https://wiki.dmt-nexus.me/Amor_f...eebase_Conversion_of_DMT The details of how the first method works should illustrate how SWIM came to the conclusion above.
FASA's decent, but it's a bit dated, so look into limtek or FASW or FASIPA.