You need to get the first ending (the “standard” one) as opposed to second (the “Meera” one).
To do this (spoilers)
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you need to make at least two of these choices:
- “Infinity” when asked what is death to you
- “Talk to him more” when amicus asks what he should do with Neferu
- “Yes” when asked if you think Amicus is capable of becoming emperor
plus choosing to submit to the will of the parents (to not get the “bad” ending)