Depends if you're a legit player or one who wants to get ahead most of the GTA V community have cheated in some way or another or so it seems there are always RP Loop menus that quickly gain RP levels however a lot are detected depends if you know what you're looking for.
Or if you feel unsafe in doing so you could use the GTA V Services section and purchase a a modders service to mod your account for you providing you trust them with your account.