Winter Nexus reward track

So during the crimson harvest I waited too long before the end of the event before I tried to finish the reward track and did not complete it. I miss judged how fast I could complete it due to seeing people finishing it the first day.

My question is, if I wanted to finish the reward track consistently for my accounts, what would be the most efficient way to spend some time to grind it? And I can either multibox the accounts or I can play 1 at a time. I appreciate y’all’s time on this.