I think that being informed can help dilute the worry. Here’s what I’ve learned:

Most microplastics found inside humans come from synthetic clothing followed by car tires. Theres a great Veritasium video on this. Plastic cookware is also a consideration.

Food & Cookware

Don’t buy dishwasher pods, they're worse for the environment (plastic waste) and worse for your wallet than just a regular fluid container. Both fluid container and pod container are plastic so theres not much improvement to be had there.

My friend with a Chemical Engineering degree tells me that the plastics are stable chemically, and insufficient evidence exists to deem them harmful when left alone in cool temperatures. HOWEVER, unreacted precursor chemicals and thermosets are highly reactive, and new plastics come still coated with this. New car smell? Thats unreacted precursor, and it’s very harmful. Additionally, plastic cookware also gets hot, breaking it down slowly, and potentially making it harmful.

Avoid plastics and “non-stick” coatings in cookware.

Clothing

First thought is to avoid synthetic clothing, but theres a catch… Synthetic clothing is significantly better at blocking harmful UV light from the sun. For example, polyester & Nylon UPF is about 30-50+, whereas cotton is around 5. UPF = SPF generally. For this, I prefer wool (UPF ~40) or denim (UPF 1000+ off the chart). However, thats hot, so using some tight knit polyester shirts is a must in warm climates. Many shirts from retailers like REI have this stuff. So far, the ones I own have never shed noticeably, though that may change.

Why am I talking about sun protection? Remember, the goal is your health, not fearful avoidance of one harm that subjects you to another.

For all fabrics that aren't expected to protect from the sun, natural fibers are preferred. Included is bedding, towels, bathrobe, pajamas, casual clothing, socks, etc.

Other thoughts

For all of this, my friend says that I probably don't need to worry, and I have never seen convincing evidence that microplastics are harmful inside the body. Yet, I operate as if it were proven, because I don't want to risk reading that I’ve been poisoning myself ten years from now.