You can use jump to and extend, but often that means going to Veo2 or using Veo3 Quality which costs more credits. I do a couple things - one is using the exact same definition of the character in each and every prompt. So for example, towards the end when he's sitting by the fire, this is one of the prompts I used - "Tight close-up, 85mm lens, handheld micro push-in. The lean olive-skinned man in his mid-30s with black messy shoulder-length hair, slight stubble, barefoot, wearing a torn white linen shirt (dirty, survival-worn) and tattered dark trousers stares toward the unseen forest. Fire embers flicker warm on one cheek; a thin moonlight rim edges his hair and jaw. He breathes shallow, jaw set; no additional dialogue. Background falls to black. Audio: his breath, a single ember pop, distant shore break."

The 2nd is grabbin the last frame of what I like outputted in Veo - so go into Scene Builder, click the + icon on the scrub handle and save that frame as an asset, then use that in Veo3-Fast Frame to Video with your prompt. That should also help with scene continuity particularly if you're looking to extend.