https://forum.cfx.re/t/help-c-issue-getting-closest-player/4748344

AimAssist.cs

using System;
using System.Threading.Tasks;
using CustomMath;
using CitizenFX.Core;
using static CitizenFX.Core.Native.API;

namespace AimAssist
{
    public class AimAssist : BaseScript
    {
        private bool _aimAssistEnabled = false;

        [Command("aimassist")]
        private void OnAimAssistCommand()
        {
            _aimAssistEnabled = !_aimAssistEnabled;

            Chat($"Aim Assist {(_aimAssistEnabled ? "Enabled" : "Disabled")}");

            if (_aimAssistEnabled)
            {
                Tick += AimTick;
            }
            else
            {
                Tick -= AimTick;
            }
        }

        private async Task AimTick()
        {
            Vector3 Source = GetFinalRenderedCamCoord();
            Vector3 Player = Game.PlayerPed.Position;
            Ped ClosestPed = World.GetClosest<Ped>(new Vector2(Player.X, Player.Y));

            if (!Entity.Exists(ClosestPed))
            {
                await Delay(500);
            }

            Vector3 Target = ClosestPed.Bones[Bone.SKEL_Head].Position;

            Matrix4x4 matrix = Matrix4x4.CreateLookAt(Source, Target);
            float yaw = (float)Math.Atan2(matrix.V13, matrix.V33);
            float pitch = (float)Math.Asin(-matrix.V23);
            float roll = (float)Math.Atan2(matrix.V21, matrix.V22);

            Chat($"Roll: {roll} Pitch: {pitch} Yaw: {yaw}");

            SetGameplayCamRelativeRotation(roll, pitch, yaw);

            await Task.FromResult(0);
        }

        private void Chat(string message)
        {
            TriggerEvent("chat:addMessage", new
            {
                color = new[] { 255, 0, 0 },
                args = new[] { "[AimAssist]", $"[LOG] " + message }
            });
        }
    }
}