Independence
Being Autonomous, Independent
noun, の adjective, verbal noun
Alone I stand. I have independence!
独立 often implies both being autonomous and independent. While it can also refer to self-reliance, it's more commonly associated with political independence or independence from organizations.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
会社を辞めて独立した人で成功した人は多くないって言うなら、そのデータやその人たちの計画、そしてどうしてそれが失敗したのかを示してくださいよ。
If you say not many people who left the company and went independent succeeded, show me the data, their plans, and how they failed.