I have found some modifications on GTAinside which can make your game like GTA 5, in some updated ways. You can still play online with those mods. Depends on servers tho.
GTA Inside : V HUD by DK22Pac - release 31.08.14
GTA Inside : INSANITY_AudioPack V2.1
GTA Inside : Better Bulletholes Mod
GTA Inside : RagDollPhysics
GTA Inside : Special Abilities v3.2.2
GTA Inside : Beta Removed Weapons
GTA Inside : Advanced aiming zoom fix
GTA Inside : HDUniverseGTAVehicles1
And lastly SA_DirectX_3_0_Beta
https://drive.google.com/file/d/1OMlVUDbCCndLAE6ecVkKjF_5kJv-_iog/view?usp=drive_link
Which can make your game look more better and more modern and almost like GTA 5.
https://www.youtube.com/watch?v=33B-9IzoHag
Here is the website, just search the mods and download for free:
https://www.gtainside.com/
All of those mods will make your game almost like GTA 5, not fully but similar. If you download them, they will be like 600mb together, GTA DirectX 3.0 is good usually cost but I link it for free, on google drive.