Best way to maximize storage space on this side window?

I never really open the window blinds since I'm on the first floor plus it's the side window:

https://imgur.com/a/Ynn2IKf

Should I use shelves so that I can stack more things onto this space?

Submitted May 01, 2020 at 06:47AM by nutrop https://bit.ly/2VPf0VE