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for witcher 3 I'd buy/install the DLC at the outset so the stuff is discoverable organically if you dont have the game of the year edition.
you possibly may not get such a big wow factor from it as original players as ER has some of the key things that made you go wow as well, whereas W3 was pretty unique when it was first out which made it feel much more ground breaking.
i'd recommend trying to find a guide to make sure you get all the gwent cards in the early game and make not of the ones that get locked away by story choices and one time access dungeons as it's one of the best mini-games out there and you'll go mad knowing there's possibly some cards missing.
and finally lean heavily into the potions concoctions and oil crafting stuff with the skill tree skills to go with them, I did a hack and slash for my first playthrough saving everything for "when I needed it" and it was fine but very repetitive, on my new game plus I switched to using all the correct oils and a combination of potions and skills that would turbo charge geralt but also put him at the edge of his corruption/poisoning or whatever its called and it was not only way more thematic he turns into the absolute killing machine he's billed as.
Hopefully the Series X update is out soon. I'm hankering for a replay of Witcher 3 as I've been reading the books recently, only one left now.