Since you seem to have some good tips in general, what do you think of these builds for LS? https://fextralife.com/monster-hunter-world-iceborne-the-evolution-of-long-sword-builds/Alot of Iceborne monsters are harder to deal with with GS than they are in the base game. Everything hops around alot so you won't get alot of openings, which is why alot of people go to Crit Draw GS (I don't like that build though). Once you get used to a monster's movements and attacks, it becomes alot easier to see those juicy 1400+ damage final TCS hits but learning the openings gets rough.
I'd also recommend most melee players to build the MR Teostra helm, arms, and waist as soon as they can. It's your new Drachen and Iceborne gives you more than enough slots to fit in QoL like health boost and the such. Master's Touch is so powerful that it invalidates most of the other set bonuses in the game for melee. None of the defensive set bonuses are that great until you get to MR70 and get a set bonus that gives you Divine Blessing Lv5, but that's a 2pc set and you can have Master's Touch AND Divine Blessing 5 with Health Boost 3 and 100% crit on softened weakpoints.
Support players - build Tigrex 3pc set asap. 75% chance of not consuming an item is crazy.
Bows + DBs - build Velkana 2pc with a certain new elder's 2pc once you get it, it'll be your bread and butter til MR70. Gives you MR Crit Element and a boost to your element altogether.
CB users - don't fall into the trap of Artillery 5, it doesn't actually increase your damage all that much. Just shoot for your core skills and add Offensive Guard and Teo set bonus when you can. Also you'll probably want at least Guard 3 since Guard 1 even with a charged shield isn't enough guard to respond with a SAED for alot of Iceborne monsters.
Bowguns - I don't know how to build for these during the story but I assume it would be 3pc Narga for True Spare Shot (75% chance of not using ammo) or using a Razor Sharp Charm from the house quests. Endgame though, Sticky LBG becomes crazy good and Spread HBG is the most broken thing in the game. You can pretty much sit in front of Teostra's face and be invincible the entire hunt while doing huge damage.
It's what i'm going to go for while in the beginning of Iceborne. Feel free to suggest anything else for LS though.