You're a MKC Coaching follower so plenty of good stuff and ideas that he already published are available. Go back through his vlogs and see if you can find a common theme!
Firstly, I'd keep doing what you're doing mostly, you're on the right track and consistency pays off.
Spicy it up a bit if you really feel the need, but very cautiously.
Something like 50% easy, 30-35% moderate and 10-15% hard (in this order i.e. start with easy -> mod -> hard) once a week for swim/bike/run. Repeat for another 4-6 weeks and see how it feels, then adjust accordingly.
Above all, stay consistent and do not follow advice from people telling you to change things up dramatically. That's what people who have no trust in their training would do. I do the same thing with very little variation pretty much every single week of the year and am yet to see a real plateau, except for when I'm doing nothing like right now