Regarding the Hadith about seeking forgiveness can increase children and wealth etc. is it deficient intention if a person does this to seek worldly gain and not for the hereafter, what should the intention be? Secondly I live away from the mosque but live alone. Must I still attend for jamat

If you are seeking Allah's forgiveness and also hoping for what He promised with it, there is no harm, since Nuh promised his people wealth and children if they sought forgiveness. But if wealth is all you want and not forgiveness, that is wrong. As for the jama'ah, if you cannot hear the adhan from your home without speakers when it is quiet, attending is not obligatory upon you.