If you now have the required 75 per cent vote, you only need to rescind registered by-laws.
In any case, my understanding is that the current model by-laws apply by default in any cases where there is no specific by-law covering that particular issue.
For instance, if you had no by-law governing the parking of cars on common property, then the Schedule 3, By-law 1 would apply.
If you don’t have the votes to rescind and replace the by-laws I would ask your strata manager about seeking a orders under Section 148 of the Act to rescind the original by-laws and replace them with the model by-laws.