From this moment forward, resolve to keep those around you focused and avoid all meetings, whether in person or remote, that do not have clear objectives. It is possible to do this tactfully, but expect that some time wasters will be offended the first few times their advances are rejected. Once it is clear that remaining on task is your policy and not subject to change, they will accept it and move on with life. Hard feelings pass. Don’t suffer fools or you’ll become one. It is your job to train those around you to be effective and efficient. No one else will do it for you.