Ithen had to regret that i did not at least make the attempt to carry out my resolution to run away; for the chances of success are tenfold greater from the city than from the country. what does this passage establish?
douglass will not always describe events in chronological order.
douglass will not reveal certain details about his life as a slave.
douglass will tell his story using the first-person point of view.
douglass will use dialogue to bring events and characters to life.

Douglass will tell his story using the first person point of view.

Explanation:

It's clearly stated that this passage is about after the things he did/went through in the past, it means he said it event by event, in chronological order.

Next thing, the paragraph seems as if every events are already revealed.

He is telling his story saying 'I', which means he's telling the story from first person's view.

He is cleary talking about his life events and all in story format, not using in dialogue or developing certain characters.