Kindly upgrade brave to have true sync option available (i.e., seamless sync of password, bookmarks, settings, history across all the connected devices)
This feature is a must to have since 2012 .
Many of the existing user have already requested you for this feature and is a must nowadays.
Implementation can be done by two ways
Like chrome save user date to cloud storage and sync it with all any connected devices of the same account.
Can use portion of how syncthing works and use it in brave to achieve desired result (e i.e., encrypt user data and store on user device locally tyen when a new device connect to the sync chain the user data is downloaded to the new device and sync successful)