We have posted a few blogs on this topic: https://www.esri.com/arcgis-blog/products/arcgis-pro/data-management/its-not-personal
The best way forward is to convert them to file geodatabases. See this tech article discussing this: https://support.esri.com/en-us/knowledge-base/convert-personal-geodatabase-data-mbd-to-file-geodatab...
We have posted a few blogs on this topic: https://www.esri.com/arcgis-blog/products/arcgis-pro/data-management/its-not-personal
The best way forward is to convert them to file geodatabases. See this tech article discussing this: https://support.esri.com/en-us/knowledge-base/convert-personal-geodatabase-data-mbd-to-file-geodatab...