If the issue is you enabled cross save with the wrong account set as the primary cross save account then the only way to fix it is by disabling cross save, waiting 90 days, then re-enabling it with the correct set up. If you recently purchased Silver on any of the accounts involved in your current cross save set up then you will have to wait until 90 days since that purchase before you can disable cross save. All of the above information is covered in the cross save help article, https://help.bungie.net/hc/en-us/articles/360049498031-Destiny-2-Cross-Save-Guide I recommend reading through the entire article.