welcome fatdan,

it's nice to hear that you have had such positive experiences with psychedelics.

Whether you are ready for dmt or not, only you can know. However it seems you have a good approach. As for hoping for closure etc I don't know if it is perhaps too much expectation going into a dmt experience. In my experience we have very little control over what dmt shows us and how that directly affects us. I can only marvel at the vastness of possibilities that we seem to be able to experience when altering our consciousness this way!

For something as concrete as the issue you describe I would suggest trying ayahuasca or an analogue, rather than using vaporized dmt. But then again, you really never know. It could be that vaporizing dmt gives you just exactly what you need.

In any case, wishing you the best of luck on your further journey.