Hi, i'm a level 3 and have this lad who's not getting into my team and is a slow trainer relative to the bulk of my squad, so im looking to sell him

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He's currently 4 SPs away from 5* and i am looking for advice on which of these 3 selling options would be best for me

1) train to 1 point away from 5* and sell, hoping for a bidding war
2) train to 5* an sell, hoping to attract people to a 5* player
3) train to 1 point away then stop, wait til i promote (mathematical certainty) and try to sell in negotiations

My own thought was just train him to 1 point from 5* and sell then pray for a bidding war. Is that what everyone else would do?

Cheers in advance