This is an important question!
The barrier is there because we are opposite in quality to the upper worlds – they are complete bestowal and we are in the quality of reception.
The way we cross the barrier is by achieving equivalence of form with the Creator’s qualities of love and bestowal. This is primarily done through the work in a Kabbalist group, where one learns and lives “from love of others to love of the Creator.”
Yours,
Christian @KabU