Hey mate,
you say your NP2 is 2 days old? It does take a few days for all the various usage algorithms, processes and applications to get their baselines. The phone is learning about you, how you use it and when you use it. There’s a ton of setup activities that go on in the background of a fresh device.
First check you have adaptive battery turned on… settings > battery > adaptive battery. That will help in the long(er) term with battery drain. Also if you’re tethering that does use extra battery, especially if signal strength is weak(er).
Chess & YouTube are using significant battery. Check they’e updated and Nothing OS is up-to-date too.
I’d suggest…. give it a week to 10 days, if battery drain persists, speak with support. But, this doesn’t look out of the ordinary for a new device.