yes, limiting CP like level and upgrade around normal player do.. and since you have unlimited gems you can chose any hero and eqipment you want. so your CP will be average like other. hero level, equipment level, codex level need to be adjusted so your CP is not overly above your hero level and account level. so you need to chose between status or effect or skill. and lastly if you attack in arena or attacked there is a record so you need to be carefull from making point earning per day that still make sense. and also dont use atk or def mod there.
i dont understand what parallel do you mean but if you mean you are using same save acoount in 2 device then yes if 1 banned then the other banned too coz they have same id...
..... well, if you know how to change id with the new one then you can keep your inventory and progress etc.. but since you got reported then it better start fresh