In a similar question from 2014 on a sister site, Stack Overflow, What should an user do when he's in a question ban with unsalvageable questions?, a moderator answered:
The typical recourse for a user in a situation like this is to contact the [SO] team for assistance. When contacting the team, you need to show that you have understood how the site works and are capable of learning from your mistakes and asking better questions. What happens with your account depends on the situation, but usually this can mean either disassociating the absolute worst questions from your account so they no longer contribute to the ban, or if your account is really unsalvageable, they might remove it altogether so you can create a new one. . . .
In a recent duplicate question, As a question-banned user on Stack Overflow should I delete my bad questions or edit them to ask some other question in their place?, one commentator asked (link):
I'm a bit surprised by the advice . . . from a moderator. Is that guidance still appropriate today?
and a community manager for the Stack Exchange Network responded (link):
With the rare exception, . . . we don't really do anything with them beyond send[ing] a canned response . . .
So this may offer a faint hope in rare exceptional circumstances, at least on SO.