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It's impossible. Reducing the size means dropping or compressing some data.
What you would need to do is experiment and decide which elements count as quality for you. It also depends on the quality of the source material. The source was of low quality, then you can shed lots of extra data.
For example:
Is it a 4K Video? Try reducing to True HD and even regular HD then compare them.
Or, is it 60FPS? Try reducing it to 30 FPS. If it's supposed to be a piece of cinematic art, 24 FPS will look nicer anyway, AND save you a shit-ton of data.
You could even mess around and down-sample the audio bitrate but I don't know if you would save much there.
Regardless, if the source isn't meant to be true 4K/HDR/60FPS Super-Duper-Wow quality, you're wasting bandwidth, time and resources. Get compressing!
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