Returning player, with a couple questions.

So I played odyssey all the way through story wise a couple years ago, and saw the the game and dlc for sale on Black Friday for PlayStation and pick it up. So I decided to go for plat. Thought I would come on here to see if there is any tips when going for the plat specifically. I have gotten the 1 missable trophy already. Also is there any items, weapons or armor that you would suggest getting or that y’all get asap when starting a new game? Also what’s the best way to gain xp and materials? I’ve been exploring a lot as well, and just got to Athens story wise and just hit level 19. Any tips or tricks to help with the game in general or for specially gaining the plat would be helpful! Thank you!