Skills point query - HZD

Hi, apologies if this has been asked before. Im coming to end game (2 missions left). Have cleared all tallnecks, hunting grounds, the 3 skills relevant side missions, all collectables and cauldrons. Im almost level 49 so will get the level 50 trophy soon but wondering how Im going to get the 3/4 skills im still missing. Is it a case of grinding out side missions or will I have to start TFW DLC? Playing the ps5 remaster if that affects anythin? Cheers