I run my own server through a managed hosting service, and the one I use only offers vanilla Mastodon which has the 500 character limit.
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I know it can be done but I don't have access to the files, it's maintained by the managed hosting provider 🙂
You can increase that with a bit of effort
https://it-notes.dragas.net/2024/10/09/2024-modifying-limits-in-mastodon-4-3/
IT Notes