In our experience, PayPal's customer support is very good, and usually regaining access to a working PayPal account is a matter of confirming your identity for regulatory purposes, or something along those lines.
Please note you can set a new PayPal account on Leanpub any time, by going here https://leanpub.com/author_dashboard/royalties/settings.
You can also switch to receive payments via Wise: http://help.leanpub.com/en/articles/5993338-accepting-your-leanpub-royalty-payments-via-wise-with-currency-conversion
If you are having trouble accessing your PayPal account, we can put a special royalties handling flag on your Leanpub account, so that no more royalty payments are sent to your PayPal account, until you have resolved the situation, and asked us to remove the special royalties handling flag.
If we set this flag, every month when we pay royalties, our system would automatically attempt to pay you any outstanding royalties you are owed, "see" the flag, not do the payment, and then try again the next month, until the flag is removed.
If you would like us to add the special royalties handling flag to your account, please let us know by emailing the team at email@example.com, making sure to email us from the same email address you use to access your Leanpub account.
We'd also like to note that even if you don't have a working PayPal account, you can still use Leanpub to write your books and generate your ebook files, even if you don't publish on Leanpub and sell through our store! Then, you just have to download the PDF, EPUB, or MOBI files from the Preview page for any of your Leanpub books, and then upload the appropriate file required by the alternative book publishing platform you have chosen.
Finally, we know it is very distressing to lose access to a PayPal account, but just to be clear, we do not have any other way to pay royalties. We have many business processes in place, including tax and accounting and processes, and sending royalty payments is not simply a matter of us signing up to a new service and sending money that way, unfortunately.