Heavy battery drain on S21 Ultra

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Hi

I've been having some pretty bad battery drain on my S21 Ultra (nearly 2 weeks old), I fully charged my phone this morning and after some light usage I've dropped almost 40% with only 1 hour 40 minutes SOT. I know it's not a good indicator but keeping on track that would barely get me 4 and a half hours SOT from full. This was whilst I was at work and I do have a pretty bad mobile network signal there which I have to use, but surely it would not cause this much drain? 

I've optimised as much as i can without ruining the experience - most apps deep sleeping, FHD+ 120hz, syncing off, NFC and Bluetooth off, low screen brightness, 5g off, AOD off and etc.

Is there anything more I can do without turning 120hz off? 

[Slizzered]

The battery life is actually tons better now I've switched over to mostly WiFi only. I have a few hours on mobile data here and there but now I'm not using it 8 hours a day my SOT has gone up to 11 hours on a full charge!