This is possible using Collections for Business Class teams.
However, in this case it appears as if you have a large number of boards under your personal boards and would like to group them into categories. One workaround might be to utilise board descriptions.
For every board, append a tag to the end of the description such as:
#board-work, #board-personal, #board-family
You can then use the description search operator to search for all boards with that tag:
Example search URL: https://trello.com/search?q=description%3A%23board-personal
You can also used saved searches to make quickly finding boards easier.
If you had to thrive a new habit during a lockdown, what would it be? Trello
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