Hi KaerfSusej.
The best thing is to try a few. The most likely candidates are the other 'related chords' from the key of C, which is where the first three come from.
Try Em, F ... they work well. Dm is the only one left after those two, but you'll hear how weak it sounds.
They don't have to be from the key, however ... you could play an E7 there, which leads the ear back to the Am ready for a new pass through them all; D major works, but sort of demands that you follow it with another chord. The G7 Carol suggests makes you want to go back to the C ...
There are countless options!
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