photoshopcafe[.]com/sharpen-photo-photoshop/?goal=0_548063c647-c93e3e5586-249020125&mc_cid=c93e3e5586&mc_eid=0f1ae77bb5
The camera and its settings determines how sharp a photo is or isn't, and there's no getting around that really. But you can sort of fake it a little bit with your editing software, making a photo seem a little sharper than the original by increasing the contrast of object edges. This tutorial walks you through using the Very common Unsharp Mask filter or FX [most every app includes it], as well as using the High Pass filter.