How to improve a nice superregen receiver

Hello everyone!
I've successfully built a super-regen receiver from this schematic (sorry for the Italian notes), and it works like a charm.

I'm just not particularly happy with the audio output level.
How you can see, the audio section of the schematic, on the right, is not perfect: it has no decoupling capacitor and all the current passes through the earphones. For this reason, I have to use the classic 32 ohm earphones and not, for example, the sensitive piezoelectric earphone I have.
For this reason, I would like to tinker a bit with this circuit. However, in order to avoid doing too many unnecessary (and maybe pointless) experiments, I would appreciate some advice.
Currently, I have a few ideas:
- substitute the earphone plug with a resistance (which value?) and connect the piezoelectric earphone between collector and ground;
- add a second BC238 through a decoupling capacitor to improve the amplification.

Any other proposal?

Problem solved: a second transistor and now it's perfect! (at least for a receiver with a single transistor in the VHF circuit...)