The phrase "after it declines" is correct and usable in written English.
You can use it to refer to a situation or condition that occurs following a decrease or reduction in something, such as value, quality, or quantity.
Example: "The market often stabilizes after it declines, allowing investors to reassess their strategies."
Alternatives: "once it decreases" or "following its decline".
Reckson withdrew its $33.75 million bid, which won the second Pilgrim auction, after it declined to drop its lawsuit, clearing the way for Heartland.
Barclays had to write down the value of its BlackRock investment in September 2011 after it declined.
Canada had complained to the UN that its grain supply contract had been cut back after it declined an Iraqi request to pay a trucking fee.
The United States and Britain said Wednesday that six major powers had agreed to consider additional United Nations sanctions against Iran after it declined to state clearly whether it would freeze its nuclear activities.
In 2007, the New York Civil Liberties Union sued the department after it declined to turn over computerized data on people who had been stopped and frisked.
His bust-ups with the US Tennis Association are legendary, culminating in a burst of tweeted swearing after it declined to negotiate him a French Open wild card.
The grand jury's decision on Friday not to indict the officers came just two days after it declined to indict the man at the center of the chaotic scene last summer in Harlem.
The Trump administration drew fire yesterday after it declined to apply sanctions demanded by Congress on wealthy Russians, while a list of oligarchs who could face future penalties was found to have been cribbed from a magazine.
He had planned to vote for the Brotherhood's party, he said, but changed his mind after it declined to join protesters calling for a quick end to military rule.
Ai, known for his criticism of China's rights record, accused the Danish toymaker of censorship in October after it declined a bulk order of bricks, which he wanted for a new work.
