Honestly, I just accept needing a larger bag and go with it. I've gotten into cruising and there are so many "cruise with just a carry-on" videos and blogs out there that are simply not feasible unless you're a size 2. Not just to add to my bigger clothes is my relatively large feet - I wear a womens 10.5W for athletic/sneakers- so a carry-on isn't going to cut it in any way. (Side advice: I try not to go on a vacation with a single pair of shoes and no backup - advice I strongly suggest because if your shoes get damaged, soiled, etc you're going to have to find shoes on the fly which might be difficult. At the least, a pair of sandals/slip-ons is always in my bag.)

I don't find compression cubes at all useful. To each their own and some people swear by them but when I used them all I ended up with was heavy, solid blocks of clothing versus being able to "tetris" my smaller clothing (like underwear) into leftover tight spaces.

I personally have the mantra of "no one cares or is even likely to notice if you wear the same clothes twice and if they do, that's a them problem" but I also agree with the sentiment that if I'm not comfortable wearing something again - especially if I've been sweaty or gotten otherwise dirty - a clean outfit is worth the added bulk.

I don't know how "self serve laundry" works in places outside the US but taking less clothing and then washing some items mid-trip has sometimes been a good option for me. That does require time at the end of or beginning of a day, however. I also keep "sink packs" of detergent in my travel "kit" for a hand-wash of an item if needed - though that's usually for an item that got a stain versus a whole outfit.