Do you mean 30 different plant ingredients? Just today: leeks, rocket, potato, tomato, chick peas, sugar snaps, leeks, red peppers, coriander, various ground spices; also (but less healthy) coffee, sugar, wheat, cacao, hazelnuts. Total 15, in just one day. Non-plant ingredients: 1, a small amount of chicken.
The trick is to treat plant foods as the main part of each meal, and any animal produce as a side, or garnish, or omit completely. So, for a stir-fry (a sauté), the main ingredients are the sauce, red pepper, broccoli. Then I might add some other veggies, or nuts, or rice, or a scattering of tofu or beef or fish. A committed carnivore would prioritise the ingredients rather differently.
If you can change the balance of plant to animal foods on the plate, and throw out ingrained ideas of what constitutes 'a meal', it becomes much easier. Also creative and fun!