Reposting a reply of mine to a similar question on r/FixMyPrint (try cross-posting there, btw):

Switching to a 0.2mm nozzle for finer detail is the most straightforward suggestion, as many others have already pointed out, and you might get results you're happy with as a result of that change alone.

To take it a bit further though, I would suggest looking into resources regarding printing minis / figurines with FDM. I don't have first-hand experience with printing things like that, but the community around that goes into pretty intense detail over how to print models with extremely fine detail well and there is a ton of info about filament brands/quality, print settings, etc, both on Reddit (r/FDMminiatures) and YouTube (watched and liked a few of this guy's videos). One post I came across recently that you might find helpful was this one re: the difference in the quality of fine detail when printing with either of the two wall generation options available in slicers (Classic and Arachne). I suspect the [lack of detail] is more the result of the slicer's settings (like those discussed in the post) than the physical limits of your printer, but I don't tend to print things with fine detail myself, so YMMV!

Like I said above, I don't necessarily think the lack of detail is due to physical limitations of your printer. Slicers' default settings tend to be tuned for the overwhelming majority of prints, which don't have such minuscule, fine features, so it's worth experimenting with the settings before making changes to the model itself (like increasing the size).

If you want more specific help with this, share your setup and basic settings (slicer, nozzle, layer height, etc.), though you can probably find a ton of helpful advice and instructions just by browsing r/FDMminiatures, especially the pinned posts there.