If i were you and i felt that my current character could have been developed better then by all means make a new and improved one. My first character was a fire element and my mistake there was roca was leaving me, and so was niss at lvl 18. I didnt know then that they'd do that. so i left it at lvl 20. My current character is lvl 39 earth and all my pets now have high amity. But I didnt delete that character. I put time and effort to build that so now it serves as my main ALT for killing Tree Devils and Rock Monsters.