I have nearly never used all my plan keywords, like I used maybe 500 of 2000, then a month ago TrueRanker asks the LTD users to buy without any option a monthly plan to recover the rank updates and to add new keywords.

The text:

Service Update for LTD account (February 7th)
We're currently addressing service disruptions caused by recent, significant changes to Google's systems, which have greatly impacted our infrastructure costs. If you're unfamiliar with these changes, you can read more about them here

Last week, we resumed updating keyword rankings, and you should now see updates approximately every three to four days. However, due to limitations with our current keyword provider, daily updates are not available yet. We recognize that this is not ideal, and we are actively searching for additional low-cost providers that can handle higher request volumes, but this is proving to be a challenge. We remain committed to finding a long-term solution that balances performance and fair usage for all users.

Some LTD users who rely on real-time daily updates have opted to upgrade to a plan at a reduced price to regain full service. If immediate access to faster updates is critical for your workflow, this may be an option to consider.

We truly appreciate your patience and support as we work toward a sustainable solution ensuring fair usage. We will provide further updates as soon as there are meaningful developments.