no strategy left to try (idiom); at one's wit's end
at the end of one's tether
powerless
Definitions (粵典–words.hk)
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Definitions (Wiktionary)
phrase, idiomatic
at a loss as to what to do; at one's wits' end; at the end of one's tether (syn.) 冇辦法, 沒法兒, 無辦法, 沒轍, 無可如何, 冇法子, 無能耐, 無奈何, 無奈得何, 沒辦法, 沒場兒, 無可奈何, 沒奈何, 沒治, 無法, 無結煞, 沒門兒, 沒咒兒念, 無變, 無路, 冇收, 沒有辦法, 無步, 沒法子, 無法度, 冇符, 無變步, 無計可施, 無法無度, 冇計, 無計