Should you put all your best material up front?
Later seems really far away. Now is far more urgent.
But what if it's a marathon, not a sprint?
A fast start is often overestimated. If you're truly capable of delivering world-class work later (as opposed to merely stalling), you might discover that in a world of quick hits, your ability to keep showing up with work that gets better and better is precisely what the market wants from you.
The people who are swayed by the fast start and the shiny new thing aren't going to stick with you for very long, are they?