lr

the least costly adobe subscription is the photography plan (which includes lr and ps).  and you can change plans without incurring a penalty.

further, your lr problem can likely be solved by posting the issue in the lr forum where lr experts are ready to help you.

if you decide to change plans, contact adobe support for a smooth transition.  there are 2 ways to contact adobe support; chat and twitter (now x):

chat:
if you have or want to purchase a subscription, use a browser that allows popups and cookies
and click here, https://helpx.adobe.com/contact.html?rghtup=autoOpen
in the chat field (lower right), type AGENT
be patient, it can take quite a while to reach a human.

twitter/x:
tweet @AdobeCare

p.s. if you're contacted by anyone (via email or private message), it's much more likely to be a scammer than an adobe representative.

Hi, we're here to help you. Kindly help us understand more. Do you need help to use to Lightroom or do you need help to change the plan from Lightroom to Photoshop?