How to get to your Dimension in 1.14 (and probably in 1.13 and 1.15 too)

ModDimensionTeleporter.java

// By Commoble#9251
// https://discordapp.com/channels/176780432371744769/179315645005955072/661244291833790494 on the MMD Discord (https://discord.mcmoddev.com/)
// How to get to your Dimension in 1.14 (and probably in 1.13 and 1.15 too)
public static void teleportPlayerToDimension(ServerPlayerEntity player, DimensionType destinationType, BlockPos destinationPos) {
    ServerWorld nextWorld = player.getServer().getWorld(destinationType);
    nextWorld.getChunk(destinationPos); // Make sure the chunk is loaded
    player.teleport(nextWorld, destinationPos.getX(), destinationPos.getY(), destinationPos.getZ(), player.rotationYaw, player.rotationPitch);
}