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I'm currently not accepting arXiv endorsement requests from people I don't know personally. I started receiving a large number of requests once it became easy to use LLMs to explore mathematics and write up results. This is a great development, but the resulting papers usually aren't written well (lacking in examples, proofs not written with a human reader in mind, and so on). Moreover, it's easy to get into a cycle where an LLM is overly encouraging about results that don't appear verbatim in the literature but nonetheless aren't research-level contributions. Ask your LLM (or, even better, a different LLM) for a candid assessment of the work as a research contribution. To improve the writing, ask it to review your paper according to my advice for early-career researchers. Read Henry Cohn's advice for amateur mathematicians on writing. You might also get insight about what mathematicians expect from mathematical writing from these notes of mine.