One thing that was super common on Mastodon / Fediverse prior to this mass migration was adding image descriptions to help be accessible to our many blind and partially sighted users here. Many people won't boost posts without them.
Please consider adding alt text to your images when you can. 
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@BlurTheFur not just alt text either, if you can. A description in the text itself is useful for those using giant fonts to help with restricted vision, for example. Just copy between alt and toot. (Yes, I'm new, so excuse the cheek!)
