Your full subscription will continue until the end of the period you've paid for. After that, you and your journal participants will still be able to view all your stories — you just won't be able to add to the journal.
Only LifeTales storage fees will still apply if you're over your free level. See https://lifetales.com/pricing for pricing information.
And if you'd like to close your LifeTales account altogether, you can download your entire journal to your computer with the tap of just one button. Then contact us at email@example.com to delete your account.