I wouldn't worry about the term breakthrough my friend. Sounds like you got more than you bargained for already so concentrate on that. Smaller dose experiences is like dipping toes in the water. Keep dipping them toes, nothing wrong with that whatsoever.
My feeling about breakthrough is this. I have seen people who stated they are ready for a breakthrough. I load up enough and they either don't hold it in, blowing it out right away, they refuse another hit or flat out decide not to do anymore after they begin feeling the effects of the DMT. These people could have broken through at any point. It was their choice not to, which is fine and good, no problem.
If you want to breakthrough, you will. You will ingest enough to propel yourself into hyperspace. The mind comes in at the last second and plays all sorts of games to survive. The mind is wrong. There is no danger. There is nothing to fear but fear itself. It can be shocking and it can definitely be scary sometimes. Know this and prepare for these feelings, accept that it is all part of the experience.
A strong breakthrough, you will forget you have eyes to open. I don't feel you had a breakthrough dose. It was close perhaps. Don't fret about it. Keep dipping your toes and go in deeper and deeper as you feel comfortable. In the end, you are entering deep waters and need to learn to swim. I don't think learning to swim by being thrown into deep water is a good plan. I feel how you are approaching DMT is very healthy. Take your time!!
Half of the experience of DMT is before and after the experience. It is all a journey! Enjoy that and as FranLover stated, "You just need to smile!" Great advice there for sure! Don't take it all too seriously. Try to laugh and enjoy it!
“Silence is a source of Great Strength.” ~Lao Tzu