What this game should do to increase longevity

[SamRF]

I'm thinking from the present state where there is an overarching story. If they manage to resolve everything, then we can start fresh.

That said, I also wouldn't like it if every expansion is self-contained with nothing to link from one expansion to the next. They can do it after every few expansions, but there should be continuation and even recurring characters and such between several of the expansions.

I'd say have 2 or maybe 3 expansions for 1 saga. Give free level boost to the start of each saga. E.g. current saga ends at 6.0 --> 2nd saga starts 6.0 and will end 8.0 --> only give free boost to start of 6.0, even when current expac is 7.0.

Boost to the start of latest saga, not the latest expansion.