Power station, plus another 1x12, if you can get the ohms ratings to work. That's the simplest way to keep your original sound. And the only way that is going to just give you more of the deluxe.
Otherwise reamping/slaving with a load box of some type. Two notes, etc.
If you simply add a speaker it's not going to help nearly as much as some forumites would have you believe. A stand may help slightly, but if it's a big issue it's not gonna help anywhere NEAR enough.
If I was you? I would get a second small combo amp and run it wet dry.
Use the DR as your dry amp, and a stereo time based fx like a delay verb or chorus, or radial ABY pedal.
If you're on a budget, I'd grab a Peavey classic 30 combo, if you're not on a budget get a DRRI.
People are going to list a million "I put my DRRI on a stand and gained 30db" bullshit options but none of them are going to work - there's no replacement for displacement.
I'd grab a similar sounding amp and run it wet dry, or a power station/reamping solution with another cab. Which means more stuff to lug around.
Any solution people offer without more wattage and another speaker is going to be complete bullshit.
Source: I've had this exact problem before with a similar amp, and gone thru all the different options people suggested on a forum.
