Hexagram 32, Héng (Duration): Line 4
恒卦九四 · 雷风恒 · 中文版
九四：田无禽。
The line (Legge)
The fourth NINE, undivided, shows a field where there is no game.
Small Image commentary
(Going) for long to what is not his proper place, how can he get game?
象曰：久非其位，安得禽也。
In plain words
No game in the field. The fourth line is yang in a yin place, long in the wrong position: constant, but without result. The Small Image asks how one could catch anything when one has long been out of place.
Applying it to your situation
If long effort has brought nothing, this line suggests asking whether the direction or position is wrong. Is the place you are persisting in the right place?
Position
A solid (yang) line in the fourth place, which is a yin (even) place, so it is not in its proper place. Its partner is line 1; one is yin and the other yang, so they respond to each other.
If this line moves
With this line moving alone, Héng changes into Hexagram 46 Shēng (Pushing Upward). The Jiaoshi Yilin verse for this change (Chinese): 焦氏易林·恒之升.
A recorded case from Takashima
Heng to Sheng: should a long-serving dignitary step down?: A gentleman asked about the fortunes of a certain dignitary, and the cast gave the fourth line of Heng, "no game in the field". Prefacing his answer with "I will speak plainly; please do not take offence", Takashima judged that the man had held high office too long, his luck and powers had waned, and he should retire before people said he was merely occupying the seat.
The hexagram
Hexagram 32 Héng (Duration). The Judgment: Heng indicates successful progress and no error (in what it denotes). But the advantage will come from being firm and correct; and movement in any direction whatever will be advantageous.
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English text: James Legge, The Yi King (Sacred Books of the East, vol. 16, 1882), public domain, as transcribed by the Chinese Text Project. Chinese: the received text. Offered for study and reflection, not as prediction. Plain-English readings and position notes by this site.