Hm, I feel I should know of a lot of this kind of books, but I can't think of any that
quite fits the lone adventurer requirement. Some suggestions which come close:
Rosemary Kirstein's Steerswoman series, where the protagonist is part of an organization which collects knowledge, but spends most of the time wandering the world on her own.
Some of Elisabeth Moon's books, though the heroines are spaceship captains or otherwise leader of, or part of, a group:
Quote:
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In Trading in Danger, Ky Vatta, daughter of the wealthy and powerful trading family, chose to leave the family business and attend Spaceforce Academy...but in her final semester, she makes an error of judgment and is expelled. Her family puts her aboard an old tub of a spaceship, and tells her to take it off to the scrapyards--Ky looks for something better to do, and ends up in what seems to be a pirate attack on the planet where she's buying farm equipment.
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And I don't know how important the gender of the protagonist is to you, but here's a couple where the protagonist doesn't have a gender or the gender is ambiguous:
Martha Wells' Murderbot series, where the protagonist is a security cyborg who has hacked its own control module.
Ann Leckie's series starting with "Ancillary Justice", where the protagonist is an artificial intelligence who used to control a huge spaceship and thousands of soldier units, but is now reduced to a single soldier unit (in other words: Looks like a human being to everybody else, but doesn't think of herself as one).