How can I stay in Germany for a long time?

The way to stay in Germany for a long time is as follows:

If you invest 1 million yuan to start a company or do something in Germany, people should also observe you for a while, and then find that it will be beneficial in Germany (creating economic value and increasing employment rate ...), and then give you a long-term residence, and by the way, you can deal with your children.

Marry a German, get German nationality (there will be a short wait), then the children can get German nationality, and finally they can settle in Germany.

Start learning German now, and then either find a German university to study for a degree, or directly find a German company to work in Germany if it is more Niu Yi, so that the children can follow.