There is no WINNING Destiny lol you go places you get stuff, ypu do harder activities you get better stuff, sometimes, its just hard to get the best of the best stuff unless you have people you play with or you craft good builds and learn encounters so you can solo them, its free to try and the last two dlcs before the new ones are being given away if you have playstation plus too
Right now on xbox theres a bundle, all the DLCs except the newest for 25$. I snagged it to update my copy (i got forsaken YEARS ago) and honestly unless you're a PvP sweat you can do regular content no problem and have a great time