If you are wishing to have data tracked across different places, and not include them in one universe (wherein, you have to join a start place to reach other places) you have to use an external database and use HttpService to handle requests.
However, this can be a little daunting and challenging; learning HttpService and how requests work can be tricky, thankfully there are a few resources out there to help with this.
Linked above, was my Roblox-Firebase module, which is an API Wrapper written on Roblox to handle API requests to Firebase, it is built and designed in similar fashion to DataStoreService and thus makes transferring from DataStores to Firebases simple, and from scratch pretty easy to set up. The article covers setting up a Firebase Realtime Database, finding your unique authentication key, and contains a simple example script to get you started. It also links to the github page, and other areas of the web to provide assistance and guiding where wanted.
Using HttpService and an external database is likely the optimal solution for your problem as far as I can tell. Hope this helps!