  We present a new measurement of the positive muon magnetic anomaly, $a_\mu
\equiv (g_\mu - 2)/2$, from the Fermilab Muon $g\!-\!2$ Experiment using data
collected in 2019 and 2020. We have analyzed more than 4 times the number of
positrons from muon decay than in our previous result from 2018 data. The
systematic error is reduced by more than a factor of 2 due to better running
conditions, a more stable beam, and improved knowledge of the magnetic field
weighted by the muon distribution, $\tilde{\omega}'^{}_p$, and of the anomalous
precession frequency corrected for beam dynamics effects, $\omega_a$. From the
ratio $\omega_a / \tilde{\omega}'^{}_p$, together with precisely determined
external parameters, we determine $a_\mu = 116\,592\,057(25) \times 10^{-11}$
(0.21 ppm). Combining this result with our previous result from the 2018 data,
we obtain $a_\mu\text{(FNAL)} = 116\,592\,055(24) \times 10^{-11}$ (0.20 ppm).
The new experimental world average is $a_\mu (\text{Exp}) =
116\,592\,059(22)\times 10^{-11}$ (0.19 ppm), which represents a factor of 2
improvement in precision.
