Hello,
I have been using confluence cloud at the free level, and like it.
I want to get a free trial of premium.
I clicked the link to get a trial of standard. I assumed that a link to upgrade to premium would appear after that, somewhere.
However, now that I'm in the standard trial, there seems to be no link, either in my profile or in any settings, that would let me upgrade to a premium trial. Where the "try standard" link was at the top (appeared when I click my avatar at top right), there is simply nothing there.
It seems that I am unable to help Atlassian take more of my money. 
Can someone please direct me to the link to a premium trial?
Thanks!