I think that they should invest into making DEC as effective and widely accepted as possible.
By that, I mean that trading DEC should become as easy at it is buying credits, if not even more. People need payment methods, an in-built exchange and DEC should be paired with as many currencies as possible, both crypto an fiat.
Afterwards, credits should get abolished entirely. Every single transaction should be on DEC, and shop prices should be adjusted accordingly (not keeping those absurd 750 DEC for quest potions). And that's gonna make DEC prices rise higher due to its demand, which is gonna attract more player-investors.
SLP price is what made Axie Infinity explode and devs should focus on replicating that.
The fees and taxes with crypto is insane. But ETH has no fees supposedly on Hive-engine. I say supposedly because the one time I tried I paid way too much in fees on coinbase and Hive engine refused.
The paypal option helps and so does being on multiple blockchains. Hopefully, the Google store helps further bridge audiences with the economy there being more easily accessible but the app does need further attention.