Your amplifier has one low cutoff frequency for the input signal, and another low cutoff frequency for the output.
Regarding the input signal, its AC portion acts through R6, C3, C2. You can calculate the time constant, and from that you derive its cutoff frequency.
Regarding the output signal, its AC portion acts through R3, R4, C1, and load R5.
Notice that if you adjust the bias carefully, you can center the output signal around 0V. Then C1 is not needed.
If you want larger output amplitude, reduce R3 & R4.