It’s been repeated so much, we don’t really want to hear it and it sounds so damned cliché…
We don’t really, fully know happens after death. None of us do. I think some of us mortals come close to understanding parts of it and the wisest of us find ways to explain some of it on some level. But the entire thing will forever remain a mystery
I think you should be careful about messing with reincarnation and have a well thought out reason and motivation for doing something quite so disruptive of the general natural order. As the main function seems to be growth and the advance of the “soul”.
Don’t get me wrong, there might be very good reasons and very powerful methods to drop out of the process, other than the natural way of fulfilling your experience to the fullest of your capabilities.
If your main reasoning is to continue doing magick and stay in contact with a spirit, there are probably other, less disruptive ways to do this.
First I think it might benefit you to look deep into yourself and ask yourself honestly why you actually really want to hang on to this one incarnation so badly. Is it your wish and purpose to truly continue the path you are taking without interuption. …Or is it the fear of losing identity?
Now… not to project of course, because to be honest, I went through a short “wanting to stop reincarnation” phase myself and after stripping the reasons I made up for myself, I gathered after some introspection that I did turn out to be afraid of losing my ego/ identity. Which is foolish, because identity/ ego is just a vehicle to help you move through this life. It is not really you at the core and self preservation is just the needed survival mechanism to make it as far as your lifeforce can take you.
Now as for continuing magick. Humans have probably done magick in some form or another for as long as we’ve developed a more complex mind. The chance that you will continue this path, if this is the beneficial and not the harmful/ regressive way to go for you, most probably you will be born with a seemingly natural talent or in circumstances that sets you ahead of many others in a future incarnation. If you keep giving this path your full dedication, you eventually might be able to become one of those ascended masters and rise above the need to rinse and repeat every detail of your incarnations.
And if your affinity with this spirit is really this strong. It may already have been there on previous incarnations. You can also spend this life solidifying this connection, so you will become part of it’s current (assuming you are talking about an angel/demon/deity kind of spirit). That way the chance that you will stay connected to that spirit in afterlife and further incarnations is getting even greater.
Also, whatever your choice may be. You might benefit from devoting at least some effort to practices like lucid dreaming and astal projection. Combined with overcoming a fear of death (which is basically a fear of loosing ego and entering the unknown for most of us) being experienced in those might help a little with the initial confusion after death and be able to set a course to an afterlife zone that connects with that spirit and/ or magick practices.
[Edit]
Really wanted to add this part but forgot…
It sounds like you feel you are living up to your potential and have a lot of fun doing so. Don’t get trapped into being afraid of what you might loose at the end of it. Enjoy it now, to it’s fullest. It will eventually bring you a lot further than fear of future losses and forgetting to fully enjoy where you are right now.