>>56194697Diamonds are definitely best kept for inventory upgrades, especially ingredient space.
The bundles they offer periodically only amount to small boosts or accelerators and don't actually provide much benefit.
That's especially considering how expensive diamonds are when using real money, it's very poor value compared to a premium plan, and yet you can earn plenty of diamonds through regular play and sleep.
To upgrade your cooking pot requires hitting your next Sleep Style goal.
It'll tell you what your rewards are, but doesn't tell you that it'll let you upgrade the pot for some reason.
Each goal you hit lets you upgrade your pot two times for +6 capacity.
You'll need to hit 110 sleep styles to upgrade to 33. This gives you a free thunder stone by the way, which is great for getting Raichu, a top-tier helper when you get a fast one with BFS.
The 7th daily update should be dropping within an hour.
I'm expecting it will likely include details about the next sleep style dex goal. It currently takes 290 to hit the last goal and get max 57 pot size, and I'm at 380+ sleep styles now.
Based on trends, the next unlocks are likely to be at 340/350 then 400/410 sleep styles.