Welcome, @Alini_Eliza_Garcia,
This is the exact reason for not sorting or grouping your My Tasks by Due date but rather by an approach more along the lines of my often-used article:
I’d recommend you and the others at your organization use Asana this way as a best practice rather than what you’re asking to do, which will be more effort and less effective, I believe.
But since you asked, you can’t actually directly require fields everywhere. If you are on Enterprise you could use Bundles to accomplish this, otherwise you have to make sure every project uses the fields you want. I’d recommend you treat the built-in Due date as your Request Deadline and just make sure you add one custom date field, Work Deadline, to your org library of custom fields and remember to add to all projects. You could also create a project template with that field built-in, and try to only create new projects from that template as an effective way to ensure all projects have that field.
Also, may I move this topic out of this private category so 800k+ others can benefit from it?
Thanks,
Larry