I don't know if you have an extra bedroom or even a loft you could inclose! That is what I did upstairs was inclose a loft. The next step was to have the new ventilation fan installed. The fan I chose was a Broan L900 901CFM with 4.1 Sones. Also used a Broan Transition 8x12 to 12 inch.
Hooked up to a Broan Electronic Variable speed control 3 amp 120V 57w. All flowing throw 12” duct for 5 feet to a outside duct. Low on the Sones so not to loud but enough CFM to completely exchange the air in the room every minute! I also use a Winix C535 Air Cleaner with PlasmaWave Technology and scented candle.
In this pic you can see the grill mounted in the celling
