Target Long Keywords & Boost With Live Streaming

So I recently got approved for Monetization again after 6 months and till that moment I managed to gain 20k subs

After I started posting videos most of my sub base was inactive so I started targeting long keywords for better ranking.

What if I start streaming and copy all of my video's keywords and buy some live views , will this method boost my channel's ranking as well?

Streaming is definitely a viable option to increase your visibility. Regarding the live views, it really depends on the quality. Most panel services are pretty poor and won't result in a noticeable difference.