The most basic answer, time and effort. It takes at least a few years to get into that market. You may be able to shortcut your way by spending large amounts of money, but otherwise it's just time and effort.

A good analogy that I like to use, as imperfect as it is, is a car company. Getting your first car takes time, there's no way around this. You can't just slap together parts and expect to be a major industry competitor right away. It takes an investment of time and/or money.

You also can't slap together parts so that it looks all nice and shinny but miss many glaring functionality. Sure I can build a vehicle with an engine, but how many people will buy my nice and shinny vehicle if it doesn't include say temperature control? Or if you can't go faster than 20 mph? Or if it has no headlights? Even simple things as not having wipers can be problematic if you don't live in a desert location.

So you have to do much like Kia and Hyundai did. It takes a large effort to get going. You build a good car, sell it at an affordable price, and continue to develop it and improve it over time. There's no shortcut, you can't just build a car over a weekend or a few months. It takes some time to get going.

And of course a lot of the lessons need to be learned along the way. Until you start, you might not realize that you can't use say part x because although it's nice in a simple car, it can't handle temperatures below say 40F, which means that although it can work in California, the car is completely useless in the northern parts of the world.

In other words you have to be willing to invest time and effort. A shinny new car will only go so far if it doesn't work. New cars that are branded lemons quickly get eliminated from the market, no matter how new they are. And those cars that are really good continue to sell year after year. They do get refreshed from time to time, but you definitely don't refresh them every 2-3 years.