If you want to change your plan then you can switch your plan and purchasing the other one according to your requirement.

1. Navigate to the top right corner of the page near 'account name' and click on it.

2. Go to 'Setting'.

3. Select 'Plan Details'.

4. Click on the 'Upgrade' option.

Note: you can see the various other plans in the new window.

  5.  Navigate to the Enterprise plan.

6. Click on 'Schedule a 1:1'

Note: A new will appear for scheduling a meeting.

7. Select a suitable time for a meeting by choosing any of the given choices.