I did it for you.

All the required tags are in the relation.
relation/6611808

You need to delete the tags you added to the way.

Hi
What's the purpose of all these boundary=landuse ways?

way/23949967

Hi again
This entity is a multipolygon relation. All tags relating to the relation should be in the relation.

landuse=farmland is in the relation
boundary=landuse isn't required

Have a read of the Usage section:

osm.wiki/Relation:multipolygon#Usage

Only if it exists & is visible.

Hi
What's the source for the id tags on the houses?

It requires removing then.

Hi
Needs amending:
way/343290219

Hi
How much of this wall is in existence &/or visible?

Hi
railway=station objects should be included with station buildings as there can be multiple buildings per station & they have their own tag of railway=train_station. I've amend to suit

Hi
To check: Which plans did you use?
The planning app drawings don't indicate a roundabout:

https://ceredigion-online.tascomi.com/planning/index.html?fa=getApplication&id=55998

Hi
I don't bother with the public transport schema as it's such a mess.

There are two distinct railway=station

Hi
All National Railway railway stations are mapped. Please don't duplicate.

Hi
Duplication leads to confusion & errors. railway:ref isn't specific, it's not clear.
Before I co-ordinated UK stations there was a half-arsed incoherent mess. All stations are now consistently labelled. If ORM want to make use of them they can write the code to suit. The 'rail enthusiasts' who designed the tagging scheme went for extraordinary detail but forgot about clarity. Refs for stations are a combination of namespace & underscore, 'ref' at the beginning, 'ref' at the ends. No coordination.
node/660667810

All national Rail stations have the three letter code using ref:crs. Please don't duplicate

Hi
All National Railway railway stations are mapped. Please don't duplicate them in train station buildings. Tag the buildings as building=train_station.

Fixed way/190390662 Thanks for letting me know.

Hi again.
Please consider twice before accepting auto-validations. Many are incorrect (esp. iD) or false-positives.

Hi
has no implication of access rights. Those are dealt with with 'access' tags.
There's no requirement for a spearate tag within schools. From the wiki:
"...but sometimes also part of colleges / companies, or commercially operated."
landuse=recreation_ground

If your "work is based on what you see at the time" You'd have seen this in the pavement & not erroneously removed sections from the route relation.
https://www.nationaltrail.co.uk/en_GB/attraction/cotswold-way-marker-stone-chipping-campden/