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You need lower pixel counts on the sensor for better ISO performance. Larger the sensor pixels, more light they get. Sony A7S have low pixel sensors and have performance better than a human eye. Night time shots with a full moon look like it’s a day time shot.

What do you mean? The current crop of high-end cameras is absolutely amazing in that respect. Take Canon R5, where usable ISO settings extend at least to 32,000 (and the upper limit is 102,400).

Is the a7s not fast enough for you?

Shooting indoors is unfixable because there isn’t full spectrum light; you’ll have to make up some of the missing colors eventually.