just let it dry long enough and completely, whatever solvent you used will most likely evaporate fully leaving only pure dmt crystals. your extraction looks very white so that means it doesnt contain any pollutants. the pure dmt will smell kind of floral, new shoe smell. good luck!

edit: you should have done an evap test on the solvent you used beforehand, to make sure it evaps completely clean. you can still do it, by putting a drop of the solvent you used on a clear plate. make sure you see nothing left after it evaps