How to quickly get to 5M impressions:

If you have a large account, getting to 5 million impressions should be quite easy: just continue publishing quality content everyday.

But for everyone else, the absolute best way to get to 5 million impressions is by using the “reply guy” strategy.

What is “Reply Guy” strategy ?

You should reply on maximum numbers of tweets. Identify accounts with 1M-10M followers, Follow them and turn on notifications,As soon as those accounts post, reply with a quick, funny, engaging/attractive reply, ... Repeat.

Keep tweeting, think some unique things and do. You should follow maximum numbers of people on twitter to gain more followers. New users doing this. 

Thanks.