Series pass...

[Towa-Musa]

Pretty sure if they updated the series pass every season there would be a rather nice uptick in ranked, It worked for feast don't see why it would not work with this.

Edit:

Instead, I think the Battlepass should be expanded slightly to like Lv50 and have more rewards tied to it so people who are fast have more to do than Lv30 and those who choose to grind at specific time points have a bigger window in the 4month major patch schedule.

This works too! ^^