Being first is nice. Being ready is what keeps you there.

Arriving early gets you the position; it does not qualify you to hold it. Plenty of people get the spot, the role, the head start, and then discover the hard part was never the getting. Whatever you are first at will eventually ask you to be good at it.

If you have got somewhere ahead of schedule, spend the head start building the skill rather than enjoying the lead. Learn the part you have been faking. The people who last are usually the ones who used the early period to become deserving of it.