How does one reduce the existing storage?

Hello. How can one reduce the storage limits? Can deleting archived project help with the issue? I keep getting this error

You have reached your monthly storage limit . Please upgrade your plan as soon as possible or contact us to speak with our team.

Welcome to the community, @simaloi! Maybe this post discussed previously should help you solve your issue:

The other option would also be to buy storage add-ons, which you can do by going through ACCOUNT SETTINGS>Plans. Feel free to contact us at support@kobotoolbox.org if you need any other support for upgrading your account.