Hi there, @Lauren Val.
I know your past interactions with our support were difficult, but I want you to know I will work with you to find a resolution.
Currently, we don't have the option to convert a PDF bank statement to CSV. However, you can explore our QuickBooks App center to see if there are any third-party apps that provide the feature you're looking for.
Before you upload the file, take a moment to open it and give it a thorough review. Here's an article that will guide you to check the correct format. I'd like to inform you the article is intended for QuickBooks Online and QuickBooks Online Solepreneur but the 3-column format is applicable for QuickBooks Self-Employed: Format CSV files in Excel to get bank transactions into QuickBooks.
Once your file is properly formatted, you can easily upload it into QuickBooks Self-Employed: Add older transactions to QuickBooks Self-Employed.
Keep us posted if the issue remains or if there are other concerns. I'm always around to help!