Check out flange inserts! My nipples dropped sizes several times and I ended up buying some inserts that I can add to my flanges and make them the appropriate size - SUPER convenient to not have to keep re-buying flanges! Something like this (sorry for the ugly link 😅).

https://www.amazon.com/Maymom-Inserts-Spectra-Flanges-Freestyle/dp/B0BNV7K1K7/ref=mp_s_a_1_3?adgrpid=134902193275&gclid=CjwKCAiAwc-dBhA7EiwAxPRylNYWhYoE36bZZgmaM4gzqwzjiR1r9w4vhn67vhFoeGgj_RXfDhqc6hoCkjgQAvD_BwE&hvadid=585843963306&hvdev=m&hvlocphy=9019684&hvnetw=g&hvqmt=b&hvrand=14027634096747273007&hvtargid=kwd-422025649630&hydadcr=25827_11415371&keywords=17mm%2Bmaymom%2Bflange&qid=1672807354&s=baby-products&sr=1-3&th=1&psc=1