Toilet won't refill after flushing every time-Kohler Fill Valve

My bathroom toilet won't refill after flushing each time, so I have to open the lid and tap down on gray adjustment level (I think that is what it's called?)-picture attached.

I've tried to adjust the the chain for any slack issues, tried to clear out/clean out the fill valve seat, but nothing seems to work.

Quick video attached as well as a few pictures.

Any ideas would be greatly appreciated! I know I could always go buy a new replacement, but this one is relatively new.

https://preview.redd.it/wtmxavelyqge1.jpg?width=480&format=pjpg&auto=webp&s=d09db681eb3e7fe0a1e6ee31b128fb69780da14d

https://preview.redd.it/dd13ttelyqge1.jpg?width=480&format=pjpg&auto=webp&s=730943a2b235aa46644d042b40304f145b8ed6b6

https://preview.redd.it/1zeiwuelyqge1.jpg?width=480&format=pjpg&auto=webp&s=dbb7ebd690d85516b20ecbb4d7f37063ecf39371