Move the mic closer to your mouth, and turn the level down. Buy a mic arm if necessary. Large capsule condenser mics are meant for use in an acoustically-controlled environment as they are sensitive, and by design pick up EVERYTHING. They're also designed for use at ranges of 6 inches to a foot, so the Yeti-included desk stand is, for the most part, useless.
Large-cap condenser mics are not meant for livestreaming, even if it's become the fad on Twitch to use them.
If you move the mic closer to your mouth and still have issues, try putting a dishtowel under your keyboard to help isolate it from the desktop and cut down on resonant amplification. If you're on OBS Classic, you can also use the Mic DSP Plugin:
https://obsproject.com/forum/threads/microphone-dsp-plugin.21034/
An unfortunate side effect of the plugin is that your mic level won't be displayed on the Mic channel meter (muting still is handled from there) and will be combined with the System channel meter. So it could be hard to get and monitor a good game/voice balance.