"not only discourage" is a correct and usable phrase in written English.
It can be used to introduce a second action or consequence that is also important or significant, in addition to the one already mentioned. Example: "Not only does smoking cause harm to your own health, but it can also discourage others from quitting."
The price controls, which not only discourage investment but also push up demand, need to be replaced by a transparent system of controlled tariffs for low-income households and market prices for everyone else.
Tom Kadala, who manages a market survey company, said higher taxes would not only discourage businesses from staying in New York but also drive talented people out of the state.
The overall concern for students throughout many of this year's protests was that the impact of loans and funding would, not only discourage young people from heading into higher education amid fears of increasing debt, but also allow for inflation of other student amenities.
Harmonising towards high taxes would not only discourage people from taking up the habit and help to pay for anti-smoking initiatives, public-health experts argue, but also reduce the incentive to smuggle cigarettes from low-tax to high-tax regimes.
Similarly, it is argued that controls on inflows not only discourage speculative portfolio investment but also enhance long-term foreign direct investment.
We should be fostering circumstances that not only discourage criminality but eliminate crime as a viable option, specifically by making law-abiding as rewarding both socially and economically.
Meeting at the school not only discourages pre-prom drinking, Mr. Clarke said, but also eliminates the use of limousines.
And he said the partisan atmosphere in Washington not only discouraged voting but also running for office.
This not only discourages some girls from pursuing the subject to university level but also makes the lives of physics lecturers harder.
To her, an airplane offered a respite, a womb where she could guiltlessly revert to simple states of eating, sleeping and watching movies, a place where use of a cellphone is not only discouraged but forbidden.
"For a long time I had a secure, steady income in a job where creativity, independent thinking and freedom were not only discouraged, they were considered serious drawbacks and scoffed at by management," said Mr. Sekac, who operates Brookside photography from a studio in his Madison home.
