Yeah i've used the bow a bit and I feel it doesn't match up on par with other weapons in terms of soloability.
Getting Focus is probably the biggest boost to DPS a bow will get, followed by power coatings and/or ele attack up if its an ele heavy bow. I wouldn't even both with para coatings on a bow if you're going solo because when applying para status you lose the elemental effect of a bow. IMO Rapid is the single best arrow type because its easy to target monster weakpoints and useful against all monsters (whereas spread has a very narrow "range" to be optimally effective and pierce is most effective against long monsters)
I've had good success with the Full G rank Uragaan set which gives Defense up L Load Up and Normal S up (boosts rapid arrow) and gem in Focus. Two bows that work well with it are the aquasteed harp which gets a Rapid 5 level 4 charge and the Opressors answer which also gets a Rapid 5 level 4 charge. On top of that, both of those bows can automatically use power coating and have a good balance of raw and elemental damage.
Edit: Quoted Anura but this is meant to be more directed at Chuckpebble
Power coatings are your biggest boost (50%) in damage and are almost required. The next biggest boost in damage are the normal/pierce/scatter up skills that will increase that shot type by 10% (30% for scatter and is also almost required for that shot type) in comparison AuL is roughly a 7% boost to damage. So it goes Focus > shot type up > Crit eye/Aul (depends on the bow like every other weapon type) > element. You can put power coatings+ between focus and shot type if your bow doesn't have it