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It's slightly tricky as there's no official way of altering the character limit on standard Mastodon, admins have to manually edit several files and then possibly change them again for every update.
For whatever reason the Mastodon developers haven't included this in the options that admins can set within the official interface. Hopefully that changes in the future.
But yes, some admins are great and will make this change anyway! 
p.s. I've recently added many more servers to the "longer posts" list, so if you've checked it previously it might be worth checking it again.
p.p.s. All the servers on this list are compatible with the seven points at https://fedi.garden/about-this-site and this is what I mean by saying they're reliable and well-run 
Would you like to create posts longer than 500 characters on Mastodon?
You can have longer posts by moving your account to a server that offers longer posts. I've done a list of well-run reliable servers with larger post sizes at:
https://fedi.garden/tag/larger-post-size
If you're not sure how to move your account to a different server, there's a step-by-step guide at https://fedi.tips/transferring-your-mastodon-account-to-another-server
Niagara.social is a Mastodon Hometown server based in the Niagara region in Ontario, Canada.
This server has a post size of up to 1500 characters.
You can find out more at https://niagara.social/about or contact the admin account @admin
#FeaturedServer #Niagara #Ontario #Canada #HometownMastodon #Mastodon #Fediverse #FreeFediverse