The Ring presents an opportunity
Gandolf tells Frodo that now that he has the ring then there is a chance to get rid of Sauron.
Frodo states that he should hide the ring or give the ring to Gandolf.
The problem here is the war is coming hiding it is just going to make Sauron come after it which Frodo doesn’t want.
Gandolf doesn’t want it because he knows what the Ring will do through him.
Bottom line
Sauron can’t get this Ring if he does his forces will be unstoppable because this ring commands all 20 of the other rings. Think CIA but worse. If there is a ring in the area Sauron is going to know whats going on there.
Frodo regrets having the ring at all. He has that “ Why ME” moment. Gandolf wishes the same and adds so does everybody else but then he states a reality.
It’s not for anyone or any one person to decide all we have to decide is “ What we can do with the time given.”