How can I get my neighborhood showing up on map?

My neighborhood is relatively new. Houses began going up in 2020. There are now hundreds of homes here and lots of streets, but the map in Pokemon reflects none of this.
I just hit level 38 and submitted the entrance sign to the neighborhood as a Pokestop, hoping it is approved. Will also be submitting the park and a few features of the park as potential stops, but with those not on mapped streets, will they auto reject?
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Your neighborhood welcome sign is likely to be rejected, as these signs don't meet eligibility criteria unless they're artistic and unique. As for the park, I'd recommend submitting a photosphere in place to show the latest background info, as well as showing your nomination in place with background detail in the supporting info section, for each element submitted.
The entrance sign should and likely will be rejected for not meeting criteria. As for the park you could always do a photosphere.
The in game map not being up to date is not a Wayfarer issue, so you shouldn't really be asking about it here, but as at least part of your post is on topic, I'll go into a bit more detail about the in game map.
Niantic uses Open Street Map data to create the maps in their games. They don't frequently update this data though (there is no schedule for when map updates take place) and the data they use when they update the map is several months old.
You can check OSM to see if your area has been mapped correctly, and if it hasn't you can either do so yourself, or ask for help from someone else who is a local OSM contributor who knows what they're doing. If/when it has been mapped correctly, you just need to wait for Niantic to update the data they're using for their games, and hopefully that data will include your local area, but I will warn you that you may be waiting for quite some time.
Wayfarer uses Google Maps as its default map to help reviewers, and Pokemon GO uses an old (January 2020) version of OpenStreetMap to generate the roads, buildings, and other similar features you see in-game.
From a Wayfarer perspective, before even considering looking at OpenStreetMap, it's more important to check that Google Maps in your area is somewhat up to date in at least its aerial imagery, road map, or StreetView. Aside from existing Wayspots, what you see in-game in PGO is largely irrelevant to the Wayfarer system.
If your having trouble getting new features through, and your local parks and other eligible POIs aren't on Google Maps at all yet, I'd suggest that you contribute by attempting to add them there (via the "add a missing place" option), as well as contributing photospheres, because these will be seen and accessible to the majority of Wayfarer reviewers once approved. It can also help to spend a bit of time leveling as a Google Local Guide because it will make your suggestions and additions to Google Maps go through more readily.