Inaccurate way geometry, knowledge needed.

It should be possible to use current public transport tagging schema(s) to change this highway from two to one lines afaik.
(as there is no physical separation)

if so there is quite a few routes to remap.

Missing possible details/POI
Exhibtion area upstairs.

Possible tags
tourism=gallery
( or art_exhibitions=yes or exhibition=art )

https://www.watergatetheatre.com/whats-on/exhibitions

Missing possible POI, local knowledge needed.
The space at Cleere's is their 'home'. The POI does not seem to be signed anywhere inside or outside.

addr:city=KIlkenny
addr:street=Parliament Street
alt_name=Kilkenny Amateur Theatre Society
company=theatre
contact:email=katstheatregroup@gmail.com
contact:facebook=https://www.facebook.com/katstheatregroup/
contact:instagram=katstheatre
description=Amateur theatre group. Welcomes creative individuals from all backgrounds who are over the age of 18.
min_age=18
name=KATS
office=company
was:contact:twitter=Kats_Theatre
website=https://katstheatre.com/

Otherwise, it may be useful to add a node with note tag.

Missing possible details
Watergate Collective theatre club/workshops

Possible tags
( main tag is company=theatre but it may not fit well with existing POI )

https://www.watergatetheatre.com/what-we-do/watergate-collective

Missing possible POI
natural=stone
historic=lifting_stone

(Jerry) O'Sullivan's lifting stone

article
https://www.ucd.ie/seanchasnafairgefarraige/en/mapsstories/iveraghmaps/
video source
https://www.youtube.com/watch?v=fwgGvFmXONA

Missing possible POI, survey needed.

Check if there is OS survey mark cut into stone wall left of gate.
https://api.panoramax.xyz/#pic=02e4c9f6-b358-4ccc-9bb0-0279edc09cf2&focus=pic

Missing possible name for road and/or building.
Sign
"The Old Road"
Source Bing Streetside 2020

Missing possible POI
"Ballyknockan Quarries Heritage Museum"

Might be only on appointment with exhibitions solely during yearly festival.
no signage visible on streetlevel imagery, only that of its operator.

Also, there is supposedly
"restored crane which first worked in Ballyknockan in the 1850s"
based on facebook/instagram post
https://www.facebook.com/61552465125205/posts/stone-cutting-heritage-museum-stone-splitting-and-talk-stone-lifting-with-indian/122263481666082170/

Missing possible bus stop.
If it is disused or similar, add lifecycle prefix and note tag.
It seems still visible in aerial imagery though.