Some buttons have stopped working or are erratic

I have a digital Casio wave ceptor watch, similar to the casio G-shock with digital and analogue displays and synchronised to a time calibration radio signal. It is not a modern smart watch.

My problem is more basic, I believe. I think 2 ( buttons B&D) of the 4 buttons used to set things like the digital and analogue time are not working, or perhaps are hard to operate. I want some guidance on how I can: 1) check it is the buttons are awkward. Some one did manage to get me the right analogue time setting, so they MAY not be totally defunct).

2) What can be done if the buttons are no longer working properly?

Note, I have found 3 settings where these buttons should work: Adjusting the analogue display, Adjusting the digital display and the home city for the time.

I failed to adjust any of those settings…

I appreciate the detailed menus will vary from watch to watch, but throwing out what looks like a good watch because it seems a couple of buttons are not working well seems very wasteful.

I hope there are some general tips here. Note I have the manual to navigate my watch and it seems fine until I need to use button B or D.