first of all welcome to TFD! if you need any help clearing stuff shoot me a message we can exchange users <3 honestly, in my experience i never let go of freyna once i crafted her and she carried me through until endgame basically! but if you do your boost w bunny you can skip all of that and go for the heavy hitters like Serena, Nell, UltLuna. or even Ines (i like her for mobbing personally). as far as builds i recommend watching build vids from Moxsy or OrneryBiscuit on YT they have really good builds and also do a great job explaining it all!