The process of accretion is one of taking separate things and slowly merging them to make larger and larger objects, which eventually combine into one large piece. For the next few days, the prompts will follow the same basic idea. You can make a choice about how far afield you want to roam to find these things to incorporate. The warmups and generators are there to give you some material to work from if you want.
Gather a few more bits and pieces (these might be images, fragments of language, scenes from memory, an event, a description of a person, a specific kind of knowledge, today’s weather report…) and play with bringing them near to each other in different combinations until something has a kind of heat or interest for you. You might make this combination by setting the pieces into a story somehow, using characters to anchor their joining, but you don’t have to jump to story yet (or argument, if you’re essaying) if one doesn’t easily percolate from the material at hand. You may choose to use these bits and pieces to augment or transform what you wrote yesterday; you may choose to start at a different center.
A simpler way to say this might just be, add some more stuff to what you wrote yesterday. Think about what draws that stuff to the other stuff. You can make a new pile of stuff or add to the one you started yesterday.