Few Accepted but Not Displaying
That’s discouraging and tiring to review and contribute, as to-date few of my accepted locations never display on Pokemon Go map.
Neighbour areas full with poke stops.
can advise? My location just behind courts, multi-purpose hall and prominent iconic location representing the place.

Comments
You aren't actually nominating pokestops but wayspots instead. As noted in the wayspot acceptance email not all accepted nominations will appear in all Niantic games.
In the case of the mural it will not appear in pogo due to not meeting the density rules for that game.
Hello and welcome @prettyrare-PGO
The underlying issue is that Niantic does not explain what happens. They do not talk about the spacing rules to try and prevent misuse of the wayfarer database.
The current spacing and editing rules to allow movement of wayspots and hence pokestops are in place because of previous misuse. This is why you can see on occasion many pokestops close together.
Although the impression you are given when you submit something is that you are submitting to be a pokestop the reality is that you are submitting something with the potential to be a pokestop.
Your approved nomination is accepted not into Pokémon Go, but into the Lightship database - this holds all approved wayspots and is separate from all Niantic games.
That is the end point of wayfarer, and what happens next is not related to wayfarer.
Each game sets its own rules as to what it will take from Lightship to use in that particular game.
For Pokémon Go the rules revolve around the use of some mapping software commonly referred to as S2 cells it breaks down the surface into smaller and smaller cells - each size is referred to as level and a number.
Google: S2 cells and Pokémon Go - Pokémongohub has a very good explanation.
The key is that in Pokémon Go only accepts 1 wayspot in each Level 17 cell, so if there is already a pokestop or gym in the game, in that cell, yours will not be selected to enter Pokémon Go. This has happened in your case.
I have looked at Khatib blk 838.
This is how it appears in Lightship circled in red
This shares a level 17 cell with 2 other wayspots.
This is from the Ingress Intel Map
The one circled in green is the loving and caring mural I presume that is in Pokémon Go. That is blocking yours. The one in Blue is the Goodlife senior citizen activities centre. This does not appear on the intel map as it is less than 20m from your wayspot, and 20m is the rule for Ingress. So yours is blocking that wayspot appearing in Ingress - it is currently a Lightship only wayspot.
It is frustrating when this happens. The way to avoid this is to read and understand the rules. Singapore is an area with a lot of wayspots already but there cells that would allow poke stops to appear.
Good Luck