SSDI: Multiple Return to Work Trials?

I'm 60 years old, and I've been on long-term SSDI for 15 years, and while my benefits are high, after I was forced to move to live on my own, I find that my income doesn't adequately cover even my minimized expenses. Yet since I (probably stupidly) signed a long-term lease, I can't move somewhere else without a huge lease-breaking penalty.

So the only solution I can think of is to enter a "Ticket to work" 9-month part-time return to work trial. But I know that my disability has not, and will not, reduce sufficiently to continue to work after that period. So my question is: Can I legally and with full knowledge of the SSA request one or more subsequent (additional) 9 month work trials? Or is one the limit?

I've searched the SSA site and other sites extensively, but I cannot find an answer to this question.

Thanks!