Take your small jar and put 5g fumaric acid in it and then fill the jar with your 99% IPA. Then mix this together until the IPA is completely saturated. The IPA will look clear, not cloudy. This creates Fumaric Acid Saturated IPA(FASI). Just let it stand for a couple of minutes, and you will have excess fumaric acid on the bottom, but that is fine. Decant your FASI away from the small jar away from the excess fumaric acid (you can filter it to make sure no undissolved fumaric acid will come across but if you decant carefully this is not needed), and into a new container (You could dry that fumaric acid that remained behind and save it to use in some future extraction).
Now SLOWLY pour your FASI into your jar of dmt saturated d-limonene. The slower the better. For best results add 10ml FASI every 5 minutes until you dont see any more cloud forming in the d-limonene. This will crash out your dmt from the d-limonene. Allow this to sit for at least 24 hours after you stop putting in FASI so that the DMT Fumarate can fully crash out. After 24 hours add another 1ml of FASI to make sure all dmt has precipitated out. After you collect the DMT fumarate from the jar, put the d-limonene back into the jar and let it sit for a few days. More DMT fumarate will precipitate over time. Proceed to step 5A