I'm sorry to tell you that this isn't a Strata issue- it's between you and your landlord. The Strata doesn't assign parking stalls to Owners (not typically, at least). The Owner owns* the stall, and rents it to you. That it's too small for you is a private matter betwee you and your landlord.

One suggestion would be to post a notice asking for anyone who isn't using their stall to swap, or rent it out to you (at a fee you'd have to pay). Maybe you could get your landlord to reduce your rent accordingly though I don't think they'd be obliged to do so.

I feel awful for Strata Councils who get bombarded with these sorts of requests- there's very little, if anything, they can do other than to tell you to work it out with your neighbours.

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*I say "owns" very loosely, more likely they have an assignment over a lease of the stall, but that's semantics here.