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. 
@BlurTheFur - can you show me an example?
@Wonam6
Sure! Here's a piece of art of mine. If you hover over, you can see the alt text. It can be something simple. As long as it gets the idea of the image across.
"Digital art of a smiling blue dog holding a purple rose in its mouth and wagging its tail"
@BlurTheFur @Wonam6 Do you know how this works on the iPhone app? I’ve tried a few different things but I can’t get it to show up.