AMS these days is pretty decent in terms of queues. I haven't seen anything last half year coming even close to the disasters of Summer 2022. If you have no check-in luggage and have to take the normal security queue, arriving 2 hours in advance is more than enough, probably 1.30 in advance will do. With a 9:20 departure you should have plenty to trains to chose from from Amsterdam Central (20 min train ride). And as Irishguy indicates the Schiphol website gives an indicating of waiting times for security.