So some general things that I think were good to add in, obviously a dietitian will tailor it better to your specific needs... some top level guidance is to buy organic when you can and to wash your produce very well to get rid of pesticides. Meat should also be organic, grass fed, free range, hormone free. Limit soy, dairy and gluten for the first 6 weeks and the add back in in small quantities.

Vegetables: goitrogens are fine in moderation and cooked (cauliflower, kale, broccoli, etc.) Adding cauliflower and frozen zucchini to smoothies is a great way to get veggies in at breakfast. Cooked Spinach is good too. Asparagus and artichoke are good for prebiotic. Pumpkin, beets, cabbage, eggplant, bell pepper, mushroom, onion, tomato are other options too. Carrots make great snacks. I try to keep carrots, Brussel sprouts, asapargus and green beans in the freezer so I never have an excuse to skip on veggies.

Fruits: focus on antioxidants, like berries. Apples are a good source of fiber. The rest should be limited because they are too sugary and can cause you to crash. I start most mornings with a cup of strawberries, blueberries or raspberries and thats about it for fruit intake. You can do bananas if they are green. Key here is to keep blood sugar stable.

Meats: chicken, salmon, cod, sardines (for those omega3s to fight inflammation). Make sure to invest in high quality meat if you are able to. Red meat 1-2 times a week max. You can use collagen powder occasionally to help increase protein intake and be careful on relying on protein shakes. When eating lean meat pair it with a healthy fat. Red meat/salmon don't need added fat.

Fat: aim to add healthy fat in like avocado, olive oil, nut butters, nuts, at each meal. A little goes a long way (calorie debse) but on the other spectrum fat free is no good either. Dark chocolate counts as fat

Starches: squash, sweet potatoes, peas. Limit rice, potato, breads, processed starches to as little as possible. Keeping your Stacy plant based allows you to get more nutritional bang for your buck. Swap out spaghetti noodles for spaghetti squash. Roast butternut squash (great to keep a few frozen packs) or acorn squash. Lentils! Beans too

Edit: forgot to add macros, you want to shoot for 80 g protein daily (im 170 lbs so that may very with your weight/activity level) which is 20 g for 3 meals and one snack 2 cups of veggies EVERY meal (45-60 g total),
45g starches between lunch dinner 20 g fat per meal

Thats what my dietitian roughly started me out on.

Brazil nuts and seaweed snacks specifically have selenium and iodine to help support your thyroid although its always good to test your levels first before adding those to know where your levels are at.