The phrase 'a plethora of opportunities' is correct and can be used in written English. It is often used to describe a large number of choices available to a person or group. For example, "The new job market offers a plethora of opportunities for recent college graduates.".
In primary schools, there is a plethora of opportunities.
With a plethora of opportunities for enhanced viewing, which services will sink and which will swim?
As well as meeting helpful people, the hopeful entrepreneurs receive $20,000 in seed money".There's a plethora of opportunities at a very early stage to raise $20,000 or $100,000 to get a minimum viable product out there," says Liat Aaronson, the executive director of the Zell Entrepreneurship Program, a scheme for final-year undergraduates at IDC Herzliya near Tel Aviv.
Globalization has resulted in a plethora of opportunities for talented young men and women.
There's a plethora of charity speed dating events.
What you can deliver using extremely limited resources is remarkable: technology can open up a plethora of new opportunities if harnessed correctly.
The continuous technological advancement provides a plethora of additional opportunities for law enforcement and security agencies to tackle the contemporary threats and challenges in a more effective and efficient manner.
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Claudia Letizia
Head Translator and Proofreader @ organictranslations.eu