You might as well just leave the fan off when you take a shower and open the door immediately(leave it open) when you get out of the shower to bring the moisture down in the bathroom to disperse the moisture to the rest of the house if you are trying to raise the humidity to the rest of the house. If that's too much moisture, have the fan running during the shower, shut it off right when you get out and then open the door.
If you really want the moisture and nobody else cares in the house, leave the door open for the whole shower and you'll raise that humidity like crazy.
...I have the opposite problem, I run the fan for the full duration of the shower plus another 10 minutes while the door is still closed and I barely to keep the moisture in the house as low as I'd like throughout the winter apart from January and February when the outdoor dew point is super low and there is more induced air leakage because of the temperature difference. Air sealing will get you to that point, if you are in need of adding bulk moisture, you are venting a significant amount of the moisture you already have when it gets replaced with the outdoor air.
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