First caveat-I'm not an Airbus pilot. I have been around a very long time though and as I see it your best way to learn is to glean all the worthwhile info from threads like this.
Plan EVERY descent, even as PM fly it in your mind, so that you will build an experience base to work from.
When you are PF fix any errors you see as soon as you see them. Say you're high and fast around 10,000 ft, fix it now don't hope it gets better. You may be wrong with your fix and it would have fixed itself but you demonstrate to any watchers that you have a plan and are aware of variations. This is the stuff that makes aviation interesting and worth doing, the fact that the air is unpredictable.
Accept that even after 45 years you will NOT know it all and keep learning and enjoying the way that things almost invariably change. That's what I did and enjoyed my career immensely.
Good luck!!