Versa and mastery is both viable, but if you stack mastery you have to sit in your consecration ground.
Prepare holy power for the dips. I am running 2nd talent on the last row and opted to go full defensive conduits besides the mandatory potency on any push keys, on lower keys it does not matter (AD cd reduction + GotAK reduction + WoG, and WoG shield conduit ) so I have CDs for any major pulls.
Plan your pulls, if nothing is available - you are running.
Don't spend Holy Power if mobs are casting spells and melee are slowed - use it on WoG when you dip.
Get trinket from Kaelthas (Sun King or whatever he is, this is a literal must for pushing).
Plan your BoPs and Kyrian potion. If pull is not big or you have healer defensive available - ask for that and reserve yours for future pulls (Dog bleed in the HoA)
Consider getting the Avenger Shield refresh legendary. You will loose significant amount of dps but it helps with interrupts when you have to run around and can't get to the mob and most importantly - extra absorb shields.
Use Wings defensively.
If you run blessed hammers - always use them to build HP before the pull starts.
Basic stuff - SotR uptime monitoring vs melee enemies.
Bleeds are full dmg and armor does not help - WoG is the way to go.
You are not alone. I get my face melted and globals. If you are pushing 19s you are in top 20 paladins in the world too so... yeah
Would be on page 30 with DH rankings with those keys