You can just change email anytime. Clic on your profile on top of your screen > edit profile > change email.

I can give you one of these combo ofc but Amateratsu + Acala + Agni would be better (2 fire ssr + 1 fire sr). Aside that if you want to run Michael i can give you Michael + Sol in addition (Sol is god tier and you'll be able to use her with any other team)

Keep me informed