Legos always seem to come in these crazy sets- if you lose one the whole thing isn’t good!
Right now on Amazon you can grab these two more slightly generic sets:
LEGO Pink Brick Box Large 402 pieces $20.00
LEGO Ultimate Building Set – 405 Pieces  $23.24
These might be a nice supplement to what you have or the beginning of a new collection!
As always be sure to double check the price before you buy- Amazon prices change quickly!