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We report results from an all-sky search of the LIGO data from the thirdLIGO-Virgo-KAGRA run (O3) for continuous gravitational waves from isolatedneutron stars in the frequency band [30, 150] Hz and spindown range of $[{-1}\times 10^{-8}, {+1} \times 10^{-9}]$ Hz/s. This search builds upon a previousanalysis of the first half of the O3 data using the same PowerFlux pipeline. Wesearch more deeply here by using the full O3 data and by using loose coherencein the initial stage with fully coherent combination of LIGO Hanford (H1) andLIGO Livingston (L1) data, while limiting the frequency band searched andexcluding narrow, highly disturbed spectral bands. We detect no signal and setstrict frequentist upper limits on circularly polarized and on linearlypolarized wave amplitudes, in addition to estimating population-averaged upperlimits. The lowest upper limit obtained for circular polarization is $\sim 4.5\times 10^{-26}$, and the lowest linear polarization limit is $\sim {1.3}\times 10^{-25}$ (both near 144 Hz). The lowest estimated population-averagedupper limit is $\sim {1.0} \times 10^{-25}$. In the frequency band searchedhere, these limits improve upon the O3a PowerFlux search by a median factor of$\sim 1.4$ and upon the best previous limits obtained for the full O3 data by amedian factor of $\sim 1.1$.

Probing More Deeply in an All-Sky Search for Continuous Gravitational Waves in the LIGO O3 Data Set