Hi @kindl,
You might have to email support to help you out:
Maybe they’ll recommend you buy the lifetime you want and then refund you the subscription you’ll have to cancel if it renews and charges you?
I’d maybe buy the lifetime, then cancel the Apple subscription (through the app store) after that, and maybe that’ll work without any issues? Rather than canceling your current subscription first?
Theoretically, LingQ should recognize that you have some subscription in the system and not force any lesson deletion — as long as your lifetime subscription is in that particular language you have been LingQing with.
I’m not 100% sure though.