For solo players attaining power level is now strictly time gated, as exotics no longer improve your current level starting from soft cap of 345. So, solo players can log in once a week to run through their weekly milestones and that's it. Also, one of the main activities for DLC -- escalation protocol -- requires multiple people. Way harder than Court of Oryx or Archon Forge. Its starting recommended level is 370. So, for a solo player the only hope of participating in this event is to stumble into some company doing it