There are two filters that I would try to reduce the brightness:
A ND0.9 - A Neutral Density 0.9 filter, often sold also as a moon filter. Doesn't affect the colour, only the brightness.
A yellow filter is also very good for Jupiter, either a #7 or #8 (now , have I got those numbers right...?) The #8 is the more common one, the lighter yellow usually only comes in sets.
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