The key thing that limits the quality of a Point & Shoot camera photo is the size of the sensor.
Most have a sensor size of about 1/1.8" such as your A540.

Almost yearly, after that they increased the megapixels, which reduced the low light performance and increased the noise.

A few years later the Canon Engineers used a slightly larger sensor (1/1.7)", coupled with a brighter lens (f/1.Cool.
They also limited the size of the megapixels to about 12. This produced a better quality photo.
This started with about the camera model G15. Look for a G15 or newer G model.
Nikon (P330) and Panasonic (LX7) also came out with a similar design on one camera model.

If you want to use a Point & Shoot camera, those camera models are about the best bet.

Joe