330nF is 0.33uF which is marked "334" in Asia. It should be available anywhere.
An Asian "474" capacitor is 470nF or 0.47uF and can be used instead.
C3 in the datasheet is a very importannt Supply Bypass Capacitor that keeps the IC from oscillating. It DOES NOT PASS AUDIO.
Your circuit has it missing.
C5 in your circuit passes audio to the input of the amplifier and since your input resistor is 10k then the capacitor should be a film capacitor of about 330nF or 0.33uF or an Asian 334 greencap. An Asian 474 will also be fine.
The The two 4.7k mixer resistors and 330nF coupling capacitor connect to your 10k audio taper volume control.
All electronic circuits need a supply bypass capacitor that keeps the supply voltage from jumping up and down when the circuit uses current. It prevents an amplifier from oscillating.
10uF as an input coupling capacitor is way too much. it should be a 330nF film cap as I said before.
The 10uF capacitor can be used as the supply bypass capacitor.
Yes. 10uF is way too high. It can pass earthquake vibrations.
Its value is 30 times too high so it can pass frequencies as low as earthquake vibrations (1.8Hz). Audio goes only as low as 20Hz and the 330nF capacitor produces a 53Hz cutoff frequency into the 10k volume control parallel with the 100k input resistance of the IC which is fine.
If you use a 20k ohm volume control the the 330nF input coupling capacitor can produce a cutoff frequency of 29Hz.