Drop a mail to spphelp@adobe.com with the following details. Previous Account: Login ID ( your company mail id)New Account : Login ID ( your company mail id) They will ask like which one you want to keep as primary one and they will merge the data like previous certifications and trainings to the ne...
You can create a group and add those users in that group with read only permission( group level) to required pages.Ref: https://experienceleague.adobe.com/docs/experience-manager-learn/cloud-service/accessing/aem-users-groups-and-permissions.html?lang=en
If you have any specific storage sizing requirement , better to connect with Adobe support team .Meanwhile you can referhttps://experienceleague.adobe.com/docs/experience-manager-65/assets/administer/assets-sizing-guide.html?lang=en
Refer : https://experienceleague.adobe.com/docs/experience-manager-cloud-service/content/sites/authoring/projects/managing.html?lang=en#deleting-a-project-or-resource-linkIt may help .