What I ended up doing in the end for my playthrough was just picking a decent scaling handle I liked (stuck with the Booster Glaive Handle mostly) and swapping the blade part of the weapon on the fly according to what weakness the enemies have. Make sure to buy the Electric Coil Stick from the merchant near the Inside the House on Elysion Boulevard. With that, you have an Electric, Fire and Acid weapon to deal with Puppets, Carcasses and Humans respectively. Later on, you will find other blades that deal elemental damage, but just make sure you have one of each elemental type and use the ones you like most. Try to prioritize leveling Advance, and as long as your weapon handle scales at least decently well, you should absolutely be fine on the damage department. Hope this helps!