It wouldn't hold up, according to CDPR.
I hope they might find time to rework it for PvP between the release of the next expansion and Cyberpunk 2077
If you feel like it. You might out-level a bunch of Novigrad stuff you have left rather quickly while in Skellige, but nothing is locked out or anything. Go when you wish
I'm already out-leveling the majority, if not all of the quests there.
I also finished 2 quests that were way above my level at the time because I wanted access to what they granted
I think I'll just finish these off and go to Skellige afterwards, level 19 is pretty high but most of the side quests there are probably are 20+ right?
Gwent. Should I focusing on one deck (Northern Realms) or building all of them?
You get cards by finishing quests and discovering more locations so there's not really much a choice? You will get cards regardless.
I have yet to reach Skellige but finished a ton of side quests in Velen and Novigrad and have more than enough cards for Northen Realms, Nilfgaard and Scoia'tael
The best cards I've got imo are for Scoia'tael. For Nilfgaard I got a lot of close combat cards that rely on the same name trait and that's a mechanic that I don't really like relying on, maybe when I get more reliable cards
Monsters is the only deck so far that I don't have enough cards to play with