The phrase "a mix of optimism" is correct and usable in written English.
You can use it when describing a combination of hopeful or positive feelings or attitudes about a situation.
Example: "In her speech, she conveyed a mix of optimism and caution regarding the future of the project."
Alternatives: "a blend of hopefulness" or "a combination of positivity".
A mix of optimism, pessimism and cynicism.
Your degree show is both an end and a beginning, a mix of optimism and melancholy.
His answers were styled in a similarly sunny manner, carrying a mix of optimism, confidence and outreach.
There was a mix of optimism and a feeling of loss as it became clear that doing things as we'd always done them was no longer good enough.
Researchers who have long promoted the cause of women in science view the incoming administration with a mix of optimism and we'll-see-ism.
"It is with a mix of optimism, pride, excitement and sadness that I am resigning the leadership and leaving the Senate," Milne said.
In his public remarks, Mr. Obama has tended to project a mix of cautious optimism and unfinished business, regardless of whether the jobless numbers exceed or fall below expectations.
The mood, they say, is a mix of some optimism about the prospects for online sales and a sense of urgency that the record stores are quickly losing ground in the e-commerce world.
With a mix of cautious optimism and rightfully cynical pragmatism, the organizations and figures so often quietly waging a thankless war to protect the online privacy of American citizens found themselves with reason to celebrate.
As you might expect, it is a mix of naive optimism from those invested in "under-performing" projects (shitcoins) who think a Coinbase listing could turn everything around, and criticism from crypto watchers who voiced concern that Coinbase is throwing its prestige and support behind less-than-deserving cryptocurrencies.
Positive baggage shows up as a mix of hopeful optimism and realistic understanding of challenges.
