With all the love in my heart, I must ask you to please not say your writing has similarities to AI. It does not. Generative AI stole writing from us, not the other way around. It is not any sort of issue on your part if someone else sees similarities to generative AI in your writing, as that is the intention of generative AI in the first place.
Your writing is your own. You took nothing from generative AI, though it continues to take so much from creatives. Please do not ever doubt yourself or your skills, do not believe you have been influenced by AI writing simply because that technology has been used to steal our voices. So many wonderful artists are discouraged due to generative AI already, some have quit creating altogether. It would be truly heartbreaking to see that happen to you as well.
I hope you can stay confident in the things you create, I truly believe your work is beautiful and worthwhile. You do not have to prove anything to anyone, you do not have to agree with someone when their accusation isn't true. Please remember that your art is and has always been yours. Generative AI has no part in that, and you do not need to doubt yourself.