I would at a minimum make sure you can change the value by both dragging and tapping and test it out with VoiceOver and Talkback to make sure the standard slider controls are working. Compare yours with a standard HTML slider people will be used to using. W3C has some examples of custom slider implementations that work ok with VoiceOver, though the value isn’t read if I double tap, hold, and drag to change the value, so there’s some room for improvement there. You could probably fix that with an aria live region that dynamically updates the value when it’s changed. I would also try it out with voice control software, here are the instructions for sliders in Windows built in voice control.