I suggest you to change Piper for Sapper cuz give you lots more damage.
Well here we go, this a full PVE guide :
Cards : 3x (red) Glassmole (30% more massive damage)
3x (Blue) Nuaele or Zaura ( 30% more MD or PD )
3x (Green) Netherbovine (30 STR)
3x (Purple) Gazing Golen ( 30% chance of getting Pain Barrier (imune knock down)
Legend Card ( well, dont worry about that for now, focus on the rest first .
Weapon gear : Try find a cheap trancended unique weapon on market , use it until you get you Legend Musket.
I Suggest you, Savinose Gear cuz gives you more damge then velcoffer , the set effect you gonna use Korup , cuz is the best for PVE. Resume use Savinose Musket with korup effect.
Armor gear: If you wanna more damge use Leather if you wanna more defense use Plate. Use Savinose, also with korup.
Acessories gear : I will recomend you to get Irredian Abyss acessories first , its cheap and easy to get. Then you focus on the Legendary acessories which you can get on Borutas Mission. Or you can wait some more updates and make the new ones that will be avalieble on Uphill to make.
But each one have a diferent status and effect so use that one you likes more the effect. But the Irredians Abyss will help enought until you get your legendarys.
Hats gear : Get hats that gives you phisical atk and HP .
That’s it ! I hope this can help you fella.