Yes, submit a GDPR/CCPA (Reddit is in California, so they are legally required to serve these request to anyone ‘protected’ by US laws) request. It’s expensive and time consuming for them. It should also help you confirm if all of your data has actually been deleted. They have 30 days to comply with the request.

My plan is, one I get my data and confirm everything is deleted, to submit another request if any data was found and will repeat this until all of the data is gone. Only then will I finally submit one more out of spite followed by immediately deleting the account. Honestly not sure how that will affect them processing it but I’d imagine it should then indeed confirm the account itself is ‘deleted’.