Oh I totally feel that!
To be clear, I am not a a registered dietitian. However, based on my conversation with Dr. Louis, and my experience of feeling this way myself, I will offer my two cents.
When I have struggled with the decision- making process while trying to eat enough high quality food, I have followed these principles/ guidelines (I am not a vegan or vegetarian).
At every meal, I will eat a source of high quality carbohydrate, fat, protein and ensure to include an abundance vegetables. Trying to eat whole food (food coming straight from the earth with minimal processing) is great but flexibility is better 
.
Examples:
Carbohydrates:
Rice - white, brown, wild rice
Quinoa
Sweet potato
Potato
Oats
Dried fruit
Fresh fruit
Bread
Oat milk
Protein:
Eggs
Milk
Fish
Chicken
Turkey
Yogurt
(most meat)
Fats:
Fatty fish/meat
Olive oil
Coconut oil
Hemp seed oil
Flax seed oil
Avocado
Nuts/ nut butter
Seeds
Egg yolk
Vegetables:
Any and all!!
No one food consists of a single macro-nutrient. Most foods are made up of carbohydrates, fats and proteins but most food offer more from one macro nutrient than another. When I have struggled with a shopping list or the decision making process, I have simplified it and ensured to include one from each group at each meal. This list is simply an example and is far from complete or extensive.
Variety is key!
Some other principles:
- Determine your protein requirements using your body weight. This should be consistent regardless of your activity status.
- Eat as much vegetables as you can/ enjoy!
- You carbohydrate intake will adjust based your activity status. You will begin to tune into this using hunger cues.
- Your fat intake should remain consistent regardless of activity status. I find that the fat component offers satiety and makes meals taste wonderful! This will become intuitive too.
- I will use this as a template and then add snacks using similar principles. As Dr. Louis mentioned in this episode, it is important to eat protein every 3-4 hours as a masters athlete.
Variety is the spice to life. I have found that using this as a guide makes the decision making and food shopping process easier! I hope it helps you too 
.