The Workflow Initiator can move documents in a workflow to the next step.
If you need to, you can move documents forward to the next step in a workflow, essentially skipping the current step. No step outcome is recorded for the skipped steps.
You cannot skip the last step if the 'Workflow Outcome Decided By' option is set to 'Final step outcome (lead reviewer)'. As a workaround, you can reassign that step to someone else, or terminate the workflow and start it again.
Only the Workflow Initiator can skip steps and if the Workflow Template rules allow it.