Destiny 2 Wayfinder’s Voyage is Season of the Lost’s first big activity, and it’s sticking around for a while.
We’ve outlined the Astral Alignment bugs elsewhere and how to deal with them. Once that’s finished, you’ll start the regular Wayfinder’s Voyage quest line.
Rescue more Ley Lines, acquire Parallax Trajectory, and complete more Astral Alignment Activities for now until the weekly reset ushers in new steps.
Your next step is completing Astral Alignment, which may or may not actually work depending on what bugs ail the activity at the time.