I write a lot of custom texts. Accordingly, from time to time I do not get a beautiful way to express the idea that the text would be unique. What to do?

I think this happens because you write a lot. This is called burnout. It is good that in the modern world invented not a few programs that help people in this or that sphere. That is why I recommend you to try using ai paraphraser https://pr-cy.io/rewrite/ I think it is exactly what will save you in such situations.