Once a year you have the chance to put a Motion up for voting on at your Annual General meeting. Doing so in a simple, concise, actionable Motion will give the other owners a chance to support, or not, the thing you find wanting improvement on.
If that gets passed it must then get done regardless of what the committee has planned and lets owners have their say to the other owners not just the few on the committee. Sometimes committees are just busy and don’t see the things annoying others and a Motion brings everyone’s attention to it.
Sometimes if committee members don’t want to seem exposed I’ve found they fix the issue before it gets to a vote and if so your issue is addressed and your Motion no longer required. Happy days.
If you can’t wait that long, you can write a Motion and put it to the elected committee to vote on whenever they have their next meeting.
Feel confident to do that even though you are on the committee as a way to get the issue raised and for you to own the issue and get quotes and write it up concisely to decide a yes or a no on taking action.
If it’s a no to the Motion you can raise it again with additional information or overcoming what was it’s objectional bit of some/enough other committee members to get it approved and done.