Books, reading and the life of words.
A writing session does not need to begin with an important subject. A particular sound, object or brief encounter can provide enough material to practise description. Choose something you can observe closely rather than something you feel obliged to make impressive.
Revision becomes more manageable when you know what a paragraph is meant to do. It may introduce an idea, explain a process or provide an example. Write that purpose in a short sentence before changing individual words.