Even tho ability scores are no longer a thing for a race, I feel it is useful to associate classes to help inform the culture.
For the Halfling, maybe intentionally focus on tropes in England.
Monk - a Friar Tuck concept? (If I recall correctly, his monastic order makes delicious alcohol?)
Ranger - a farmer or shepherd or beekeeper using nature magic.
Rogue - a goodnatured, wellmeaning thief, being part of a deadly but happy family mafia.
I tend to think of police detectives as the Rogue class. The Halfling could be part of a Human citys security force, tracking down criminals.