The usual gear or tweaks/room dilemma seems to have arisen again on this thread. I don't see why they're opposed. The OP is looking for a warmer sound.
We don't know the extent to which the OP has dealt with isolation and other tweaks, nor do we know the kind of room being dealt with or that room's treatments.
If I was the one posting, I would be ready to invest in a new amp only after those other factors had proved ineffectual. Because then I would know the true sound of any amp being tried. I see no reason that this is a dilemma. It's a sequence and we don't know where the OP is in that sequence, yet.