If you can ive found buying in bulk and sharing the cost with someone else or saving it for later. I find it best to pack away the extra until you need it or you tend to go through way more then you need and then it didn’t end up saving anything anyway lol

Grocery shopping: make a weekly meal plan. Plan that veggies can be used across several meals. Add beans and lentils where you can. Check what grocery store gives better points or bonuses that week.
Utilities: call annually and ensure you’re getting the best deal available.
Getting solar on our home has made our bills almost in the positive
Do surveys online for extra bonus cash. Purkle has been great, I’ve redeemed a few hundred in the last 2 years