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Voting power goes up automatically. It goes down by voting. So... Vote a bit less and your voting power will go up.

To get more influence here you should invest in some Steem Power ;)

Thanks makes sense. What does steem power do, and how do you get it?

Steem power gives you more curation power on the platform.
You can get it by powering up in https://steemit.com/@pjcswart/transfers

It's a long-term investment in the platform, and pays back by gaining more influence.
Long-term means: it takes a while to "pay out" your steem power and it happens in phases.