Is there a hardware or software way to further increase the speaker output
For Elecrow 5” ESP32-S3 Crowpanel (DIS07050H):
You can remove the two capacitors marked in the figure below and connect the pins together, or directly short-circuit the two capacitors to amplify the sound.
Comments
This really solves the problem with the sound being too quiet on this display (Elecrow 5” ESP32-S3 Crowpanel (DIS07050H), board version 3.0).
@Elecrow , Are these capacitors even needed there or is this a mistake? Because of these capacitors it is impossible to work with the resulting sound volume level, and also the amplifier datasheet talks about "magnetic beads" with a rating of 1000 Ω in place of these capacitors:

Dear Nick,
I hope this message finds you well. Thank you for the update.
Our technical support team is currently looking into the issue in your message. Please be patient, and we will get back to you as soon as possible.
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Thank you, I'll wait, I wonder what will come of this and whether the sound level problem will be solved by hardware, since I plan to use these displays in my project.
I can also recommend to those who want to enhance the sound on a 5” HMI display V3.0 another sound library (not the one recommended in the guides):
https://github.com/pschatzmann/arduino-audio-tools
It's a bit tricky to figure out, but it allows you to boost the sound software-wise.
Hi Nick,
Hope you are doing well. Thank you for your patience while we are looking into the issue.
Our technical support team is currently looking into the issue in your message. Please be patient, and we will get back to you as soon as possible.
Thanks! Have a nice day!
Hi Nick,
Thank you for the patience while we were looking into the issue.
Sorry, there is a problem with the design of this place. Connecting a capacitor here will cause the volume to be very low. In fact, it is OK to connect directly without a capacitor, or connect a magnetic bead as specified in the specification.
Thank you for your support.
Thank you also for sharing.