Research on play consistently finds the same thing: fewer toys, played with for longer, beats a room full of options.
Rotate instead of adding
Keep six to eight items out and store the rest. Swap them every couple of weeks. What comes back out feels new again, and you buy less.
Favour open ended over single purpose
Blocks, stacking cups and simple figures can become a hundred different games. A toy that does only one thing gets one afternoon.
Watch what they return to
The toys your child picks up unprompted are the ones worth keeping in rotation. Everything else can go into storage without protest.