The phrase "alone care about" is not correct in English.
Did you mean "only care about"? If this is the case, you can use it to express that someone or something is the sole focus of concern or interest.
Example: "I alone care about the environment in this group; everyone else seems indifferent."
Alternatives: "only care for" or "solely concerned with".
It remains to be seen whether voters understand such issues, let alone care about them.
No one else seems to notice – let alone care – about the deluge.
These little nocturnal animals are so unobtrusive that very few people ever see them or even know they exist, let alone care about their survival.
Hell, most of the people we saw — your Japanese, your French, your whatever — they can't even speak English, let alone care about Merle Haggard".
More generally, America's lone stand against a deal to rescue the Kyoto treaty on global warming has stiffened European convictions that they, alone, care about saving the world.
It remains to be seen if they will notice, let alone care, about the preservation of burlesque traditions in the face of corporate America's best efforts to titillate them.
The Confederation of African Football (Caf), for example, has traditionally voted for the Swiss because it believes he alone cares about the continent.
She seemed to display such cold disregard for those crushed by the wheels of her personal brand of progress, it was hard to believe she fully understood what human beings are, let alone cared about them.
By his will alone, caring about America will erase the advantages China has in paying workers shit and treating their immediate environment like an open-air sewer and chemical dump.
It's the sort of stuff that most people don't really say out loud even to the people they care about, let alone a total stranger.
"I totally rage out about irrational things that I'd be embarrassed to share with people I care about, let alone people that don't know me," Jessy Lanza told THUMP in May when asked about the impetus behind the follow-up to her 2013 debut, Pull My Hair Back.
