This is a more focus post about a new role in the pricing structure, but there are some similar ideas here
If we exclude the external role, we can synthesis our options between "Project Managers" (called user in Wrike, expensive ) and "Commentators" (called Collaborator, free).
A collaborator CAN'T Event create a task. It means if you do not want to have 2 different ppm/task management software in your company, all your employees have to be users=project manager=expensive.
My management won't accept to pay 300$ by basic user.
My suggestion :
1. Keep "Collaborator" as they are. Free/ultra limited.
2. Rename your actual "User" "Project Manager", but keep their seat exactly as today. Keep your pricing model.
3. Between them, create a brand-new role "user".
This would be a paid user, let's say between 90 & 120$,
The new-users could create their own tasks, (optional, eventually manage their private-non-shared folders), but they would not be able to create shared folders, or reporting etc..
So pricing model would offer a intermediate price point for intermediate features.
This would help to consider having more people onboarding the tool, but not paying a project manager role for letting people managing at least their personal todo list in the same corporate software.