You can start by going to Amazon and ordering a copy (it’s an older book so available for cheap used) of “What Color is Your Parachute”.
This book has been used successfully by many guidance and career counselors to give their clients a starting point for getting in touch with their interests and aptitudes.
There is no one who can figure this out for you and hand it to you on a silver platter. Any professional who does this will require full participation and thought from you. A lot of it is what you can do yourself.
Here in the States, for people on disability, there is the OVR DEPT. whose job it is to guide people in this endeavor. OVR stands for Office of Vocational Rehabilitation and common sense dictates that something similar exists in Canada.
It will just have a slightly different title or acronym but the idea will be the same.
Your social worker (or even Doctor) should be able to give you its specific title and phone no. After that, it’s your job to follow up and get an appt. with the right person.
In the meantime, give your thought process a jumpstart with the book. You’ll be the one who needs to do the bulk of the work in this endeavor. The professional exists just to steer you a bit in the right direction. After that the ball is in your court.