May I suggest two articles, one for canceling the subscription and one for removing Load Balancer(s).
Just in case we’ve missed a step to remove it, if you login to the Cloudflare dashboard and click on your image in the upper right, drop down to Billing, select Subscriptons from the menu in the left sidebar, Load Balancing is the first item, click cancel to the left of that. Let us know if you have any issues.
Furthermore, might be there still is a “lost” DNS record from your setup. To resolve this issue, I’d suggest you to follow below steps:
Log in to your Cloudflare dashboard.
Go to the DNS settings for your website.
Look for any DNS records related to the load balancer (usually A, AAAA, or CNAME records with the name of your website).
Delete any records associated with the load balancer.
If you cannot delete them, contact Cloudflare support for assistance as there may be a residual configuration on their end.