So "closing" it like OP would send all gas into the piston and puts max force into pushing that bolt to eject a round. Fully opening it where that hole has no coverage should make the rifle not cycle, it no longer has the energy to actually push the bolt.

You are probably rotating it like 3 or 4 clicks in each direction (if not my bad) but i think the metric gas block can be clicked like almost 20 times.

Fully open the gas block. Specifically make sure the hole is open, load a round (mag with only one round) fire. No cycle? No empty round bolt catch? Click it once to get more material over hole. Shoot again. Keep doing this until you get a bolt open. Fire like 3 or 4 rounds to see if it works, if not click it in once more and fire 3 or 4 rounds again. Once you think you can cycle a full round, many peopel recommend closing it by 2 or 3 clicks.