It would be better if you could be more specific tag for the buildings you are adding.
e.g. building=house
building=*

Also the zoom levels are updated at different times so at some zoom levels the old image may show longer than others.

The database is updated immediately. The various maps using the data vary in how soon they update maps but the Standard layer on osm.org updates quite soon, often within minutes to a day or so.
You may need to clear the cache in your browser to see the latest image or use Tor browser which is unlikely to be caching an old image.
I see the new name you added.

Hi
the lake multipolygon shares an outer segment and this produces an error in osmi and in JOSM
https://tools.geofabrik.de/osmi/?view=areas&lon=153.35844&lat=-27.89175&zoom=18

Hi
The name tag is not used in this way.
The correct tag to use is addr:housenumber and addr:street .
… like this one way/847000377#map=18/-37.84323/144.95499

Hi, for the business premises, I made separate building footprint and land boundary tags.

Hi, for the business premises, I made separate building footprint and land boundary tags.

I reinstated the landuse=residential area and adjusted out a commercial building.
The building tag is only for building footprints and not for the whole block areas containing houses.

Undeleted Our Lady Help of Christians Primary School

Hi
you could be use a more specific tag for the buildings you are adding.
e.g. building=house
building=*

I think this addition of a park here is mistaken. It looks more like a private driveway and residential houses.
Yarra Glen boundary and a label on Bell Street near the shopping centre is already mapped.
relation/2423695

I altered the mapping here to be consistent with the OSM norms

Hi
It is best to map school grounds to the fence line instead of the roadway centre lines. Accuracy is preferred over aesthetics.

Hi
Are you able to map the boundary and access ways to this park as it is not readily discernible from the map or satellite imagery.

Hi
you could be use a more specific tag for the buildings you are adding.
e.g. building=house
building=*

Flagstaff Hill is already mapped...deleted these duplicates

Hi
you could be use a more specific tag for the buildings you are adding.
e.g. building=house
building=*

Hi
you could be use a more specific tag for the buildings you are adding.
e.g. building=house
building=*

Hi
the new roads you have added seem fictitious to me.
Could you explain your intent and give more information about the new ways you have added, thanks.

Hi
building=house negates the need for
description=House