How does the map look? Can you see clear features consistent with the quoted resolution?
Without any additional information, it looks very good - your refinement is hitting the Nyquist limit imposed by your pixel size (or binning).
If your particles are binned, you might consider refining with unbinned data.
If not, you might consider looking at post acquisition super resolution (calling @rbs_sci & @alexjamesnoble!) - https://www.biorxiv.org/content/10.1101/2023.06.09.544325v1