The phrase "a multitude of attempts" is correct and usable in written English.
It can be used to describe a large number of efforts made to achieve something.
Example: "After a multitude of attempts to solve the problem, we finally found a solution that worked."
Alternatives: "a large number of attempts" or "numerous attempts".
Despite a multitude of overheated attempts by less-gifted choreographers to update "The Nutcracker," George Balanchine's straightforward version arrives annually at the New York City Ballet as a blessed relief.
A multitude of /b/ users attempted to log in with the new password, and the account was automatically locked out by Yahoo!
With an increasing amount of families moving out of San Francisco, city leaders have created a multitude of bills that attempt to create conditions in which working-class families can continue to keep up with the ever-increasing cost of living and change low-wage work in industries that are notorious for abusive practices.
Back in the 1980s, Oldsmobile was one of the first to attempt integrating a multitude of functions onto a touch screen.
Turkish officials chalk it up to a multitude of factors: what they say is an attempt by Europe to export its terrorism problem to the battlefields in Syria rather than address rising Islamophobia and problems with integration; laws that limit European surveillance powers, and even a personal distrust of Erdoğan among European leaders due to his Islamist roots.
A multitude of actors with different, often clashing interests attempt to influence the unfolding of events and to get their specific answers about the big challenges of our age.
There are a multitude of tax considerations to keep in mind when attempting to quantify the tax costs involved in the business transfer.
In my blind attempts at feeling better, I stumbled on a multitude of knowledge with the ability to benefit not just the dissociated, but the average person.
In an attempt to retrieve the disaster, he began to gather a multitude of mercenaries, offering double the customary pay, and summoned help from his allies.
Some artist's (especially within the same genre) attempt to outdo each other with their theatrics, which could mean a multitude of things.
