In reply to J Whittaker:
As benlatham said, being stronger makes every move feel easier because it is further from your maximum. Strength is also the slowest thing to build up so I would never neglect strength training entirely at any point, regardless of what your goals are. But strength training alone without any endurance training will lead to the first few moves feeling really easy, followed by a terminal pump building up very quickly.
I would aim to do maybe one session a week that is strength based and make your other session(s) endurance based.
For the strength side of things, you will be wanting to do short hangs, with decent rest aiming to recover almost completely in between reps. They should be hard (though ideally not to failure every time, it is easy to injure yourself if you are failing each time) and the sessions should be low in volume.
With those rings, you will be wanting to use the crimp or pinch holds and adjust the difficulty as needed to make it feel hard but doable. If it is too easy, add weight using a rucksack or a harness. If it is too hard, use your feet on a chair or some scales and then try to reduce the amount of weight on your feet each time.
For the endurance sessions, you could do repeaters (usually about 6 reps of ~7 seconds hanging, 3 seconds rest then a longer rest between sets) although these are really somewhere in between strength training and power endurance training. For trad at the grades you are climbing, an ability to hold on/recover when on a route for a long time is going to be the most important thing.
So for this longer endurance, you are going to need to make it easier so that you can hold on for a lot longer. I would suggest keeping your feet on the chair and then spending a shortish amount of time on the crimps/pinches (maybe even doing a set of repeaters on them if this isn't too hard) before switching to the jugs for a longer period of time to try and recover. Rinse and repeat. This is to simulate short crux sections, followed by trying to recover at the next decent hold/ledge. If it gets too easy, try to increase the ratio of time spent on the harder holds.
The endurance workouts will get boring so have something to listen to/watch to keep the boredom at bay.