What is the name of the domain?
What is the issue you’re encountering
Most of my redirect rules were deleted when downgrading to free
May I ask if you could check the Audit Logs for any clue if there is still something left and could be paresed out and used, in case where you might not have any screenshot or backup of them since before? 
Checking the Docs, there is a difference in the number of the available rules per plan type:
I’ve seen instances where rules disappear if plan downgrade happens.
Unfortunately, I am unaware if there is any other way except via Audit Logs to get them back, if so.
Generally speaking, downgrading your plan does not lead to any changes to how your existing rules work. If you’re over the quota, you won’t be able to add or enable new rules, however your existing rules should still be rendered in the dashboard, returned by API, deployed at the edge and function correctly.
If for some reason this isn’t the case, you can always fetch a previous version of your ruleset using API end-point GET https://api.cloudflare.com/client/v4 /zones/{zone_id}/rulesets/phases/{ruleset_phase}/entrypoint/versions/{ruleset_version}: Cloudflare API Documentation.
Once you retrieved your rules, you can re-upload them by updating a zone entry point ruleset via PUT https://api.cloudflare.com/client/v4 /zones/{zone_id}/rulesets/phases/{ruleset_phase}/entrypoint: Cloudflare API Documentation.
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