First off, I wouldn't go for a breakthrough experience on longer lasting psyches just yet as you are new to the whole scene, and these experiences can be very intense. The beauty about DMT is that when smoked and a breakthrough experience is acheived, the dose will only last a matter of minutes, not hours. Though time sometimes can cease to exist when in such experiences so it can seem infinitely longer.
On that note, I would suggest a low dose (1-2g) of mushrooms since you liked the DMT headspace, or barring that, a low dose (1 tab/drop) LSD. LSD is generally considered to have less potential for a ''dark'' trip. Mushrooms tend to play on one's emotions a lot more than LSD does.
I would suggest you do your research on whatever it is that you choose to imbibe. Read the megathreads pertaining to set and setting, read through experience reports on Erowid and BL, but for now avoid reports about bad trips as they tend to cause anxiety about having bad trips, which is a self-fulfilling prophecy. This is not to say that you should ignore the possibility of having a ''bad trip'', just don't dwell on the possibility. If at all possible have some benzos on hand in case of any extreme anxiety, and if you are to take anything away from this post, it should be this; Go With The Flow. If any issues about your life arise during the trip, do not attempt to ignore them and push them aside. Do not resist. Think about it, and allow them to resolve themselves naturally.