The real question is WHY do you want to break through  just a place to start but if dmt is denying you a breakthrough maybe its because you arent ready at this point in your life. maybe your intentions are not allowing you.

try practicing meditation to still and focus the mind.

At the end of the day breaking through is a decision but its hard to make yourself do something you don't fully feel confident about. take the time to ask the questions you need to ask. Develop your temple (setting) and your set until you truly feel you are ready. When you feel this and use the proper equipment with the proper dose you will certainly breakthrough. Only if its what you really want

With dmt sometimes its better to let the right time find you than to force it.

much love and safety