The validity of reality is entirely dependent on the results of introspection.
Chasing portals only to have the door slammed shut, should be more than enough invitation to breach into the beyond.
Vigor and will are co-conspirators.
Travel infinitely inward seeking only truth. Leaving no stone un-turned, actions reflecting endless possibilities. The river of time will ever flow in one direction, paralleling the forward intent. The choices made may not follow the personal clock, but to look back, dwell with doubt, would resist the current bottle-necking the flow with perverse inaction. Instead, throttle with courage and resolve, and even boulders will crumble before you.