When my dds were 3 they loved happyland, imaginext, a doctors kit, an ELC fold up kitchen set (was great as it fit under the bed!), tea set, wooden chop up cake, superheroes, paw patrol. We played orchard toys board games. Books - anything by Sue Hendra, Nick Sharatt (you choose was a favourite!), the dinosaur who pooped series, please Mr Panda, poo in the zoo.
When they were 6 they both loved little figures (shopkins, hatchimals, disney characters). DD2 loved dolls - enchantimals, my little pony, LOL. They loved a dolls pram and build a bear. We played games like bugs in the kitchen, dobble, snakes & ladders, jenga, connect 4, guess who, magic tooth fairy game. Books - we started chapter Books favourites were daisy and the trouble with.. and the cat and the King. Also the fairytale hairdresser (picture Books but lovely!).
At both ages they loved a dressing up costume of their favourite character. Also my busy books (a book with 10 figures and a playmat, loads of characters available!) Also sticker books were always a winner!