If you have any plane boys, keep them, as after this season it will raise a LOT since it is a limited unit.

Withered Bonnie will decrease a lot when the season ends, it is a limited, but 20K+ of these exist, making it very low value after this season.

You can easily make some profit if you sell a GWF for a GWF Gift and some souls (people do this trade because it's a chance for a shiny)

Shadow Bonnie might be a good tower, but when it comes out, it's gonna be very low in value because they're are gonna be atleast 10K+ of these that exist.

Marionette's Puppeteer is a very good tower, but since it's a summon tower, the value can only go down from this point on.

Gamepasses can be sold for 800 souls or multiple can be traded for anything (ex. 3 For Withered Bonnie)