Standard practice for schools is that the name goes on the school grounds, not on the school building, except in unusual cases such as two schools sharing a campus, or when the building has a name different from that of the school.

Please don't make up names for things.

It looks to me like the towers were already mapped. Is there some reason why you're adding them again?

The "name" field should only be used for actual names, not descriptions. For example, it's obvious that a walkway is a walkway because it's tagged as "highway=footway".

What are you trying to do that involves drawing large, untagged outlines?

Please don't abbreviate names. It's easy for a computer to decide it needs to shorten "Lane" to "Ln" if it needs space; it's much harder to decide if "St" should be expanded to "Street" or "Saint".

Looks to me like you got everything.

For situations like this, where you want to simply revert everything, the best tool is probably JOSM (https://josm.openstreetmap.de/). You'll need to activate the "Reverter" plugin, which will give you a "Revert changeset" menu option in the "Data" menu. Enter the number of the changeset you want to revert, make sure it's doing what you expected, and upload the resulting changes.

The "name" field should only be used for names, not for descriptions. Something like when a building was completed would go in the "start_date" field.

What are you testing, and since it pretty clearly didn't work, are you planning on reverting it?

What TIGER data have you deemed unnecessary here?

Additional imagery used: DigitalGlobe Standard and NAIP Washington 2015.

This isn't a park, it's a couple houses.

It looks like you're taking out far more nodes than you intend. For example, way/409571420 went from 72 nodes relatively evenly spaced over three miles, to just eight nodes, with a maximum gap between nodes of 2.25 miles.

On straight segments of ways, it's generally considered good practice to leave nodes at periodic intervals. Because of the way the OSM API works, if you download a region containing a way, but that way has no nodes in the area, the way isn't visible.

The Cabella's in Post Falls is already mapped (it's that big building to the southwest), so please stop adding it.

That doesn't look very park-like to me. It looks like somebody's house.

Looks good in both JOSM and the website map.

It's not clear what happened, but it looks like this edit may have broken the banks of the Spokane River.

Why did you delete a section of the Little Pend Oreille NWR boundary? According to the official map (https://www.fws.gov/refuge/Little_Pend_Oreille/map.html), that's an inholding in the refuge, presumably consisting of privately-owned land.