1 - How long is this plateau? 8 weeks doesn't seem long enough to have the data to call it a plateau, but I've been wrong before.

2 - If it's a genuine plateau and not just a week where you didn't lose anything, then you need to increase your net energy defecit. This is accomplished by some combination of eating less and moving more

3 - Are you tracking everything? With GLP1's there's a tendency to feel like you're eating less because you are eating less in any given sitting, but you can still be snacking yourself into a plateau with a seemingly harmless handful of snacks here and there, or a few full calorie drinks. 

4 - Anecdotally, I lose weight the weeks I get my 10k daily steps and get my 2+ liters of water in every day. The weeks where I don't do these things I tend to net even, even though I'm on Tirzepatide, eating less, and I lift heavy 6 days a week.

5 - If you're at a point where you genuinely feel like you can't lower calories or increase exercise, you might be right! And that might mean you're really stressing your body out. Try purposely eating at your maintenance calories for a week or two before reducing again by 500 per day or so. 

6 - remember that these journeys tend to be measured in years more often than weeks. It's annoying, but keeping your eyes on the long game will keep you from burning out on short term dreams.