What do you actually mean by "no longer have full access to Lightroom"?
As far as I know Adobe does not take One Time payments for the photographers subscription plan. It is always by the month. So I don't what you paid and to whom you paid it.
Go to the Adobe web site and log in using the same Adobe ID email address and password you used when you purchased the subscription. Check your subscription status.
Make sure you are "Sign In" in the Adobe Creative Cloud app with that same Adobe ID.
As far as I know Adobe does not take One Time
You can pay by the full year in one payment.