There are a couple of plans in the pipeline that the development team is working on for bard.
Right now they are looking into adding new gear that has the “All songs +” property so that song effects can become more powerful through slots other than just instruments. They are aiming to implement this as soon as possible, but as an adjustment to precede this, they have also decided to increase the effect values of certain songs. The team will need a bit of time to get everything ready, but we’ll keep you posted once there is more information.