What are you smoking out of again?
I probably always pack enough to break through, but if it doesn't work I never feel bad about it (unless the trip itself was bad, which has only happened once or twice so far). I take every failed launch as a sign that it wasn't the right moment for it to work. My body sometimes refuses to inhale properly or my hand will not keep the torch on for a long enough time to get everything heated up. It's strange because this kind of coordination isn't hard to manage, but there are moments when it just will not work properly. I see it like my body is making use of its veto right. So be it.
If you are now back to colors and whatnot then you can take it easy. Find a proper piece to smoke your spice out of if you don't have one already (e.g. a GVG or VG), and give it some thought as to why you are doing this. That is to say, do you have any specific intentions behind doing dmt? If you did break through right now, what would you do with the experience? Could you gain something out of it, would it be beneficial to you? Would you have to inner tools and technologies to discover meaning and value in it?
Sometimes we rush into things and potentially valuable experiences fly right past us because we are not in the right mindset to process them. Sometimes our minds are cluttered with past experiences that are still in cue to be processed and integrated and there is no room for new things yet. I find that psychedelics in general are something very sacred and I would not want to waste a trip, that could potentially teach me many things or help me get some needed work done, just because I was impatient.
I say this because of your statement "I ended up smoking a lot more," which sounds a bit like you're just trying to force it to happen. Maybe you're not, and I apologize for this conjecture, but at least consider the above points and try to figure out if smoking it right now is really going to give you anything.
Personally I've gotten a lot from sub-breakthrough doses. And the times I felt like I got nothing at all from spice it gave me reason to contemplate my relationship with this amazing entheogen and I got something out of that too. Once figured out what I wanted, and my mind in a better place the experiences became in themselves more meaningful again.
So do take this chance to engage in some introspection ... in fact, take any chance to do that

introspection is never wrong IMO

These experiences can be so much more than the few minutes they seem to last. Breakthroughs are overrated, experiences are overrated. It is the whole, the all inclusive context of everything that involves you and the cosmos that is important. At least this is my take on the matter. I must always remind myself to look beyond the obvious and into the greater and deeper spaces to see the essences that are behind the manifesting things.
cheers & love
Enoon