There's a limit on the number of custom cards you can show on the latest home page.
SAP SuccessFactors HXM Suite
There is a max Limit of 100 custom cards which can be in the repository within Manage Home Page. There is a limit of maximum 12 cards per user on the home page itself.
More details on creating custom cards available on sap help guide Creating Custom Cards for the Latest Home Page
SAP Help Link for the Latest Home Page Experience for End Users
2979275 - New Experience for the Home Page [2H 2020]
2979675 - The Latest Home Page where to find To-Do's
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