Say you propose a fix to the UN security council. The plan will be considered by the permanent seats, and on seeing there are more downsides than upsides, they

Say you propose a fix to the UN security council. The plan will be considered by the permanent seats, and on seeing there are more downsides than upsides, they veto the plan. What will you do then? I do agree the org needs to adjust it's rules, but how will you impose the plan without a member leaving due to perceptions that the plan is biased? And what if that member is a superpower country? Where are your armed peacekeeping forces coming from then?