@Ivana - You could try launching any of the paid features (Timer, Voting, Hide Frames, etc.) to see if you are prompted to upgrade for free for 14 days:

Results in:

Note that if you do upgrade and create a bunch of boards/projects/etc., once the trial is over any more than your allotted free plan editable boards will all become locked/unavailable.

If you are unable to trigger the prompt for a trial and have not had a trial in the past, I would suggest asking Miro directly about this by reaching out to the Miro Customer Support team via this special form.

Hi @Ivana 

Welcome to the Miro Online Community!

Please go through this documentation/guide to change your plan or upgrade

https://help.miro.com/hc/en-us/articles/360011780620-How-to-Change-Your-Plan