Upgrade Extraction Process

Your software
My Mautic version is: V3.1.2
My PHP version is: 7.3.27
My Database type and version is: mysqlnd 5.1.12-dev

Your problem
My problem is: Is there an extraction process for Mautic v3.x (DB, assets, etc.) data that can be imported into a newer version of Mautic v4.x? With a goal of the older data being migrated/converted appropriately into the v4.x version

These errors are showing in the log:

Steps I have tried to fix the problem:

I think you are better off upgrading the old system and moving the data then.