One thing that you can do to make Mastodon posts much more readable/much more accessible is to put your hashtags at the end of your post.

Trying to read text which is littered with hashtags and blue hyperlinks is an accessibility nightmare. Put links at the end of your post, like this, instead!

#Access
#Accessibility
#Readability
#Disability
#ADHD
#MentalFatigue
#MentalExhaustion
#Brainfog