The question I want to ask you is how can I increase my voting power

To increase your voting power (VP) you will need to power up your hive. I can see (as below) you've worked out how to power down and exit your rewards from the Blockchain so it shouldn't be too difficult to do the reverse and power up instead.

I can see you've been here since December 2017. I have been here since June 2017 and I guess the difference is that I powered up all my Hive rather than power down and that's why my VP is higher, because my stake is higher.