Sometimes, no amount of tweaking will fix the problem. Here's when to accept the loss and move on.

Your matcha tastes bitter or flat. If every cup comes out bitter or just 'meh' despite your best technique, the powder itself is likely poor quality or too old. It's time to toss it and buy fresh. Reputable brands often sell sample sizes, so you can test without committing to a big tin.

Your whisk is falling apart. If your bamboo chasen has broken tines or is starting to smell musty, replace it. A worn whisk can't aerate properly. They're inexpensive, so it's not a big investment.

You're using culinary-grade matcha for ceremonial purposes. Culinary matcha is more bitter and less vibrant—it's meant for baking and lattes, not traditional tea ceremony. If that's what you're using, you'll never get that sweet, frothy top. Save it for smoothies and switch to ceremonial for drinking straight.