Freezing Your Food
If you know you're not going to need that food again for longer than a week, then freezing it is your best option to keep the freshness locked in.
For example, avocados can last up to 6 months in the freezer versus 1 week in the pantry, and the same with bread. Parsley can be frozen for about 4-6 months, and celery sticks can last a whole year.
Just be sure to store them in a freezable, sealable container such as a silicone pouch and you're good to go.