Yes. Good handheld technique can noticeably reduce camera shake:

• Stand in a stable stance with your feet planted and avoid leaning.
• Tuck your elbows into your body and keep your posture compact; bracing your head and arms against your body helps.
• Support the camera’s weight with your left hand and grip firmly with your right, while pressing the shutter gently rather than jabbing at it.
• If using autofocus, half-press first, let focus lock, then fully press.
• Control your breathing: inhale, exhale, and squeeze the shutter at the calm point after exhaling.
• After pressing the shutter, stay still until the exposure is complete.
• Brace yourself or the camera against something solid whenever possible: a wall, railing, post, or even the ground/knee while crouching.
• If the camera is resting on a surface, press it gently into place so it doesn’t shift.
• Use a 2-second or self-timer to avoid shake from the button press.
• As a last resort, shoot several frames and keep the sharpest one, since shake varies from shot to shot.

A tripod is still best, but these habits can improve sharpness when handheld.