Instead of setting a goal of getting through some number of cards, have you considered spending a maximum amount of time per day?
Like say you block of 30 minutes per day for Anki. Most days you'll probably have time left over, but some days you may have cards left to review by the end of the 30 minutes. But that's okay. You can just do them tomorrow. The point is to be consistent, not to be a completionist.
It would probably help to start reviewing old cards before learning new ones as well.
And of course you can start with whatever small block of time feels like it would be easy to complete like 15 minutes or 5 minutes. Maybe even 1 minute; you can always gradually increase the duration as you rack up a streak.
Like say you block of 30 minutes per day for Anki. Most days you'll probably have time left over, but some days you may have cards left to review by the end of the 30 minutes. But that's okay. You can just do them tomorrow. The point is to be consistent, not to be a completionist.
It would probably help to start reviewing old cards before learning new ones as well.
And of course you can start with whatever small block of time feels like it would be easy to complete like 15 minutes or 5 minutes. Maybe even 1 minute; you can always gradually increase the duration as you rack up a streak.