Why would you hang on to be an instigator only? Most people sell and move on. Some companies produce in the time range we want and some don't. I've divested from companies that I did not like at some point. I did not leave my money in if I was dissatisfied only so that I could sue them. That doesn't seem like good advice to give investors.
"failure to release TLD within 12 months of data lock"
This argument would be laughed out of court for one reason in particular - COVID. Also, investors were adequately advised of the significant impact causing further delays (in detail) in regulatory filings.
Unless you need that money soon, there are other options to consider like contacting one of those law firms that have investigated NWBO or filing a regulatory complaint about the failure to release TLD within 12 months of data lock. The law firm could always announce they are investigating the issue and that might shake the information tree.