The phrase "a variety of mostly" is correct and usable in written English.
It can be used when describing a range of items or options that are primarily of a certain type or category.
Example: "The store offers a variety of mostly organic products, catering to health-conscious consumers."
Alternatives: "a range of primarily" or "a selection of mainly".
Mariachi, small Mexican musical ensemble composed of a variety of mostly stringed instruments.
Moore is featured front-and-center in the film, touring a variety of mostly European nations to hold them up as inspirational examples for the US.
It sells what it bills as "relationship enhancers" — oils, creams, lingerie and a variety of mostly pink sex toys, with winky names like the Cabana Boy.
Twice he visited the United States, where he held a variety of mostly menial jobs in Chicago, North Dakota, and Minneapolis, Minnesota.
For years, PC owners have been able to load up Minecraft, find a server and play a variety of mostly fan-made mini-games, set within the blocky confines of Mojang's creative masterpiece.
In Where to Invade Next, Oscar-winner Michael Moore (Bowling for Columbine, Fahrenheit 9-11) tours a variety of mostly European nations to hold them up as inspirational examples for the US, but notably excludes all of the UK.
In subsequent years, the idea was embraced by a variety of politicians, mostly conservatives, including Newt Gingrich and Orrin Hatch.
China is exerting its influence across Nepal in a variety of ways, mostly involving financial incentives.
You can also transform cell phones into speaker phones with a variety of gadgets, mostly in the $15 to $200 range.
He worked at a variety of jobs, mostly at delicatessens, restaurants and supermarkets, and took some college courses.
Four circuit judges recused themselves, in a span of just two hours, for a variety of reasons, mostly conflicts of interest.
