How did my iPhone just die? It worked last night!

Last night (6/2) my phone was working fine but when I plugged it into charge, it turned off, unresponsive to anything just a black screen. Startled, I left it on my wireless charger and for a few minutes it turned back on but it wasn’t in the state when it restarts “Passcode to enable Face ID, etc.” I plug it back in thinking I was alright and next morning (6/3) my alarm didn’t go off because it’s just dead. No response to buttons, no charging indicator, no vibration when mute-unmute.

Charger has served well for a year so idk what went wrong. I am using the stock apple cube outlet thing and a black belkin extended charger 9”

any ideas?? Urgent problem thanks!