Close to 2 Hours spent in this one game, filled all soul boxes and 3 switches activated, slowly losing hope ;-;

Relaxing End hasn't made a vid of this so im stuck up to the point of all soul boxes filled up, at stronghold. I have absolutely no idea what to do now. PLS HELP. Hints or something would be amazing. I can say this, there a many colorful perk bottles around the map. I shot them with commando paped, thundergun, and even ray gun paped. No idea what to do now. Thought I was onto something in the Weird Stone temple underground but I can't manage to do anything. Pls Reaper, help a man out lol.

Yo Add me if anyone wants to play: Yodadsops