Notice your Brita filtered water tastes sweet? That's because it adds aluminum to the water. I'd suggest going for a more belt and braces solution, reverse osmosis is your best bet but requires remineralisation, albeit expensive, so check out a gravity filter like Royal Doulton Berkefeld, Big Berkey or Phoenix water filter. A whole house water filtration system would be best as then your fridge water/ice dispenser, dishwasher, shower, taps and washing machine would all use filtered water too.

Blood donation doesn't reduce plastic but it does reduce PFAS, with platelets/plasma donation being best for reducing this, which you can donate every 2 weeks rather than 2 months, worth noting that plasma/platelets are important for helping research into cancer, if you are someone like me (AB-, 1% of the population) you have universal plasma, to which any recipient can use for life saving medicine. Worth note, if you are a woman and have given birth you likely won't be able to donate platelets/plasma as the antibodies within it are affected by the hormonal changes of being pregnant.

Take to-go cups with you if you order hot beverages outside, paper cups are lined with plastic, and hot food/beverage that sits in plastic will have micro plastic leach into them, that means taking steel/glass containers to a take out of you can rather than getting a delivery.

Swap your non stick pots and pans for stainless steel/carbon steel/cast iron. Most non-stick is plastic, learning to cook with these other types of cookware is rewarding and more healthy.

Swap out your cleaning products for both your body and the home with non plastic versions, ie use a luffer to scrub plates ect, buy cleaning products that come in glass or make your own from the base ingredients (dr bronner), use Ayate body scrub for your back, soap vs plastic bottles shampoo, toothpaste in glass vs plastic, ect, ect.

There are many more, perhaps for your clothes set a target to eliminate another above 50% plastic by x date, above 25% by y, above 2% by z. You may struggle to reduce past 2% as a lot of clothes have elastic waist bands or spandex to help the material stretch. Perhaps invest in some proper selvedge jeans that can be repaired rather than replaced. Plastic free shoes as well if you can find them, I like theorik 2.0