Box most toys, give her some to play with, change toys once in a while. Means:
I box most of her toys or old toys in several big clear boxes and stack them in another room (not her regular play room). But she can still see them if she goes to that room.
For the toys she plays everyday, I use same "12个小一点合子的架子" and category them, but books are on bookshelf.
Then when she gets tired of current toys, we can go together and change toys from storage box. (sometimes, she might go herself and get some toys out as well. But at least this is not very often to my kid)
Previously we had all toys out in her play room, but I do see that she only play a few same toys in a period of time. Since we use this method, the playroom stays clean everyday and she still have toys to play. And she can clean up herself since there are only 12 small boxes. (I also try to let her play with one or two box at a time or clean up the toy on the floor before she takes another one down though this may not always under control.)
But it does help us get easier now :)
Good Luck.