Here's a link with lots of ideas:
Go vertical. Cheap shelving unit, of you won’t overload it, stackable bins with a way to write on or label them as to their contents.
I love this transformation that Traci from Beneath My Heart did! Remove the closet doors, add some shelving and a desk. Create a fun focal point with a turquoise peg board, and viola...office out of a closet! Now I want one! Lol!
Oh I see! Lol! That makes sense! I love this option from the container store, although it is probably expensive! Maybe it could be used as inspiration! https://www.pinterest.com/pin/404409241539374171/