Bard has been a standalone job in many games, all you need to do is -check this out- add musical abilities that deal damage:

FFV - Requiem, a song that deals massive damage to undead enemies

FF Dimensions - Dire Dirge, a song that deals damage depending how low HP you have

FFXI (and XIV) - Foe Requiem, in its original FFXI version where its a dot

FFXI's line of Threnody songs, could easily be reworked as dots/damaging abilities

FFXI has other lines of songs that are way too lengthy to list here, all they need to do is pick a few names and turn them into damaging abilities. Radiant Finale is a step in the right direction, but I would prefer to see Bard have its archery aspect shifted to another job.

Link to all of FFXI's Bard abilities: https://finalfantasy.fandom.com/wiki...al_Fantasy_XI)