Either he mis-spoke, or you mis-heard regarding you not getting "full benefits." If you are currently getting SSDI or SSI or a combination of both, then that's as full as it gets. Of course, at $750/month, your benefit is smaller than if you had worked longer and paid in more, but it's not correct to say you are getting a "partial" benefit. You are getting a good deal less than the maximum possible, but probably most disabled people are getting less than if they had worked at a high paying job for 40 years. So if you talk to 10 random people on disability, they probably get 10 different size checks. But each person is getting the full benefit they are entitled to. There are people who can't get SSDI at all and would only be able to get SSI. That would be people who didn't work long enough to qualify for SSDI. Either you qualify or you don't. Nobody "partially" qualifies. If you don't qualify for SSDI, then all you get is SSI. All people in your state who live independently and get just SSI, get the exact same amount. Those living with parents get less.

Hooking up with a benefits specialist is not easy. I've never met one. Your state has an office of Vocational Rehab. They offer help to assist you in finding some work. It can be part-time work that does not interfere with your benefit. Voc Rehab has helped someone I know get to see a benefits advisor.