Backporting a mod from 1.20.1 to 1.19.2 (cannot find symbols)

[proJM-Coding]

Description

Hello! I am working on backporting a mod I found to 1.19.2 and I am having some issues with importing symbols which I believe don't exist in this version (could be wrong, this is part of why I ask). I fixed some errors by changing net.minecraft.registry.RegistryKey to net.minecraft.util.registry.RegistryKey but there are still 5 more errors:

/workspaces/elytratweaksmod/src/main/java/osbourn/elytratweaks/ElytraTweaksMod.java:5: error: cannot find symbol
import net.minecraft.entity.damage.DamageType;
                                  ^
  symbol:   class DamageType
  location: package net.minecraft.entity.damage
/workspaces/elytratweaksmod/src/main/java/osbourn/elytratweaks/ElytraTweaksMod.java:7: error: cannot find symbol
import net.minecraft.util.registry.RegistryKeys;
                                  ^
  symbol:   class RegistryKeys
  location: package net.minecraft.util.registry
/workspaces/elytratweaksmod/src/main/java/osbourn/elytratweaks/ElytraTweaksMod.java:17: error: cannot find symbol
        public static final RegistryKey<DamageType> FLY_ON_GROUND_DAMAGE =
                                        ^
  symbol:   class DamageType
  location: class ElytraTweaksMod
/workspaces/elytratweaksmod/src/main/java/osbourn/elytratweaks/mixin/LandingMixin.java:9: error: package net.minecraft.registry.tag does not exist
import net.minecraft.registry.tag.FluidTags;
                                 ^
/workspaces/elytratweaksmod/src/main/java/osbourn/elytratweaks/mixin/StopFlyingOnDamageMixin.java:7: error: cannot find symbol
import net.minecraft.entity.damage.DamageTypes;
                                  ^
  symbol:   class DamageTypes
  location: package net.minecraft.entity.damage
5 errors

I am working inside of github codespaces if anyone is wondering. Thanks!

[proJM-Coding]

I have been told that things have been changed around with RegistryKeys and RegistryKey which would make RegistryKeys.DAMAGE_TYPE become RegistryKey.DAMAGE_TYPE. This fixes the error:

/workspaces/elytratweaksmod/src/main/java/osbourn/elytratweaks/ElytraTweaksMod.java:7: error: cannot find symbol
import net.minecraft.util.registry.RegistryKeys;

[proJM-Coding]

Another error down! import net.minecraft.registry.tag.FluidTags; was only used to check if the entity was in water which I quickly replaced with https://maven.fabricmc.net/docs/yarn-1.19.2+build.28/net/minecraft/entity/Entity.html#isSubmergedInWater()
Just to make it clear this is my first time touching java and modding so if anything seems very "not best practice" that is why.