同意曹老师解答

strike it rich 发横财

He hoped to strike it rich by investing in ginseng.  

他希望通过投资人参发大财。

Happy New Year and hope you strike it rich!  

那麽,你的新年新但愿是什麽?

live steam  n./vi. 直播

The live stream can also be simultaneously archived and formatted for video on demand. 

直播流也可以同时存档和视频点播格式.

Big Li migrated from Hubei to Beijing to work as a security guard, before striking it rich livestreaming full-time.

【翻译】大李从湖北移居北京做保安，在此之前，他通过全职从事畜牧业，打拼得很富有。

【分析】

Big Li migrated from Hubei to Beijing to work as a security guard, before striking（动词） it （宾语）rich （宾补）livestreaming full-time（方式状语，之前可以加by）.

strike 既可用作及物动词,也可用作不及物动词。用作及物动词时, 接名词或代词作宾语。作“打, 击”解时还可接双宾语, 也可接以形容词充当补足语的复合宾语。作“给…以(深刻)印象”解时,还可接以as 加名词、形容词或现在分词充当补足语复合宾语。

Big Li migrated from Hubei to Beijing to work as a security guard, before striking it rich livestreaming full-time.

《牛津词典》

strike it rich：(informal) to get a lot of money, especially suddenly or unexpectedly

live-stream：n & vt. to broadcast or receive live video and sound of an event over the Internet.

这个句子显然是中国人写的，其中livestreaming full times属于用法错误。作者将现在分词livestreaming full-time用作striking it rich的方式状语，但根据《牛津词典》，live-stream是及物动词，必须后接宾语。如果不接宾语就应该用名词live-stream或名词化动名词，此时full-time应该是前置定语。

Big Li migrated from Hubei to Beijing to work as a security guard, before striking it rich by full-time live-stream(ing).

译文：老李从湖北来到北京当保安，后来全职做直播，一夜暴富。