You need to carefully log Part 61 times in order to show you are qualified for an R-ATP or an ATP.

Beyond simply being able to get an ATP, fly as much PIC as you can in as complex of an airplane as you can.

Horizon, and the industry, has swung wildly over the last few years and there's no way to know what you'll be looking at when it's time for you to get out.

That's a **** answer I know.