If people didn’t already know (you can disregard if you do)... Farm the Hallowed Lair strike on the Tangled Shore. If you do the method where you all die at the end after beating Fikrul (i.e. when the chest pops open), you can replay the encounter with Fikrul (without needing to do the whole strike again) and it counts towards the 40 strikes every time you beat him. It’s also the NF this week so you can farm Mindbender’s Ambition at the same time if you have 3 guardians (arguably you need 3 for the Nightfall version). On top of that, you can farm catalysts this way (I got Wardcliff Coil, Prometheus Lens, Riskrunner all in the 40 runs). (Heads up though, I personally am not a huge fan of the gun)