Broken Apple watch 3

Having left my watch on charge for over 24 hours the watch wouldn’t turn on and just displays the Apple logo. Have attempted reset on numerous occasions by holding down both buttons at the same time for a minimum 10-15 seconds but still stuck with logo. Only time it doesn’t display the logo is when the battery runs low and it goes into low battery mode and displays the time in top right of the screen along with prompting to charge the watch. What should I do?