Six in the third place answers a querent whose situation depends on the attention of a particular person above them: a manager, a patron, a partner, a figure whose favour has become the axis of their outlook. The reading is unfavourable and it is also urgent, because the amount of regret the line predicts is explicitly tied to how long the arrangement is allowed to continue rather than to the arrangement itself.
Structurally the querent is sitting directly beneath the only source of energy in the figure, which is why the situation is comfortable enough to persist in. A reading landing here often finds someone who is not unhappy. The line's point is that the comfort is borrowed and reversible, that nothing is being built which would survive a change in the other person's interest, and that the querent already half knows this. What is being asked for is not insight but movement.
The advice is to begin generating something of one's own, immediately and at whatever small scale is available, rather than waiting for the relationship to resolve or the favour to be formalised. The text offers no version of this line in which no regret occurs, so a querent should not read the counsel as a way of avoiding cost. It is a way of limiting it. Acting now produces a manageable regret; waiting for the situation to declare itself produces the larger one the line names second.