Getting Builds Right Without Wasting Your Time
The most common mistake I see people make is chasing the perfect artifact set across dozens of runs, then building a whole team around characters that don't actually synergize because they followed a meta guide instead of understanding how their own account's inventory works. I spend most of my time telling people to stop pulling for weapons before they've even locked down their artifact base builds. You pick your character, you check what main stats matter, you equip whatever hits those numbers, and then you decide if your team composition can actually use it. The order matters because swapping characters mid-build process usually means you've already wasted artifact substats on a different main stat you now regret. I learned this the hard way with Tartaglia when I invested heavily in his Hydro DMG set before realizing his best damage comes from his skill rotations being supported by Electro application rather than raw Hydro damage numbers.
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The shortcut version: open your inventory, filter artifacts by main stat category you care about, sort by level descending, and equip the highest-level piece that rolls at least 3 meaningful substats for your intended role. That's it. If you have three pieces with decent substats, stop looking for a fourth. Your tenth attempt at finding that perfect flower with ATK% and ER will probably give you something worse than what you already have. The reason this works is that most players underestimate how much weapon and constellation support can compensate for mediocre artifacts. A well-suit weapon at refine one will outperform a perfect artifact piece any day. The real bottleneck is substat distribution, not main stats, because once you hit decent baseline numbers on main stats, the game's damage formulas scale from there. I keep hitting one edge case that ruins build planning: when you're running a character like Yae Miko who benefits from Elemental Mastery through Electro-Charged reactions, but your team is composed primarily of characters who don't trigger those reactions frequently enough to make EM meaningful. I spent three weeks optimizing her artifact substats toward EM when her actual damage output was tanking because my team composition didn't support the reaction playstyle. The fix was straightforward — swap one team member for someone who applies hydro consistently, then rebuild her artifacts around what actually works with your team rather than what the guide says is optimal in isolation.
Another thing nobody mentions is that artifact main stat priorities shift depending on whether your character scales from HP, ATK, or DEF. Sayu's entire kit benefits from HP scaling, so an HT% main stat on her sands is infinitely better than an ATK% one would be for Raiden Shogun. Beginners pile ATK% onto everyone because it's the easiest stat to understand, which is why their damage numbers stay flat. If you're building quickly and want to skip the trial and error, I recommend this approach: start by pulling for the weapon your character officially scales best with, then grab the artifact set that gives the largest damage bonus matching your primary stat type. Equip whatever pieces hit level 12 minimum and have at least two useful substats. Stop upgrading anything below level 10 unless you're saving material for something else later. The downside to this quick-build method is that it leaves you with suboptimal substat rolls that require significant rework later. You're trading optimization for speed, and sometimes the speed isn't worth it if you're planning to tackle Spiral Abyss floors beyond floor 9. The workaround is to accept that quick builds are temporary solutions. Once you clear a stage comfortably, you can go back and refine individual pieces without feeling pressured to optimize everything at once.
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One more thing: don't upgrade artifacts until you've confirmed the main stats are correct. I wasted roughly forty thousand mora on full CRIT builds for a character whose damage came entirely from normal attacks that scaled from normal attack DMG bonus, not crit. That's about ten artifact enhancement attempts at higher levels, and it happens constantly when people follow the wrong build guide or apply another character's artifact set to theirs by mistake.