Remove it, ask your GD or any Demon available to help you. Do not accept that it is a part of you. Start now, waning Moon in Aquarius, or after the VoC is fine too.
Thank you for your precious advice. I am working on this as it's way more complicate than it seemed before.
I know I am a bit off-topic but, I need to clarify more on this. I asked help from the Gods and partially received, but I feel I need to clarify something by myself.
I learned a new "vampiric" ability, that is exploiting this thoughtform. As I created it, it is connected to my heart chakra, but it's free to wander the astral and I found that a vampire can "call upon" my thoughform and start feeding on it, thus draining me.
If I consciously refuse this thoughtform, it remains in the hands of the vampire. If I recall it (I learned how to), it seems like I free it from vampire and I feel more energized, with clearer thoughts, and I do not feel vampire's will (this happens when the thoughtform is trapped in his astral hands).
Basically, I am not able to destroy it with my powers, the Gods I consulted did not remove it (yet? maybe). I am slowly working to "accept myself" instead so I will not feed anymore this "part of me" that I project outside. So the thoughtform will slowly vanish.
Would this work in your opinion? I feel like I am stuck in a loop-