Struggling with Maya animation. Any advice?

Screenshot of my timeline. The individual actions are animated, however they too far along on the timeline and x axis. How would I fix this?

Hey, I'm a University Student who has only just started using Maya for assignments. We had an assignment where we were supposed to animate a walk into a run into a jump, however they were very unspecific about details, so I left space in the timeline when animating each action to fill in the sections, however I now need them sections to close up that space, but don't want to have to reanimate everything, however simply moving the sections along the Z axis breaks the model and I'm not sure how I would go about fixing this issue.

Apologies I may not be the most knowledgeable, so may need a little more explanation of certain details, since I'm still wrapping my head around everything in the software