Over the next few years, keep an eye out for what kind of play your kid likes. A couple of important things I've learned about my own kid:
1) She loves rough-and-tumble play, which enables her to engage with kids (especially boys) who are her age or even younger, so that has become a thing I help her to find. (She also adores kids who are older than her, so mixed-age activities are a big win for us.)
2) She doesn't do imaginative play with objects, which has resulted in some wasted toy money. For a while I worried that she didn't do imaginative play at all, until I realized that she does whole body play, with herself as a character in the game. As a result, I'm channeling her into theater, which she is loving. She also has developed a love of board games.
We're also fortunate enough to live in a town with a "toy library," so I've been able to try out a lot of different things at little cost. Borrow or buy used as much as you can, until you figure out what types of toys or games work for your kid.
