What happens when I run out of hot storage mid-season?

Two paths. Upgrade your plan — upgrades apply instantly and get prorated, so you're not punished for doing it mid-cycle. Or free up hot space by moving finished albums to cold storage, which doesn't count against your hot allowance. Most photographers do a bit of both: keep the current season's work hot, push last season's completed deliveries to cold, and upgrade only when the hot tier genuinely can't keep up with your shooting volume.