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One of the best investments comes as a power account, that boosts your influence on your own posts, and comments. It's called Steem Power.
Here is a great very long video by @jerrybanfield why his method works for him, and it will for you too.
https://steemit.com/steemit/@jerrybanfield/steem-video-ad-1-on-facebook-and-youtube-featuring-10-reasons-for-usd10-steem-in-10-months
He put 30k into steem power in his belief it is 10x times under valued.
I'd copy that if I had the $$$. ;)