Something original and thematic, besides the predictable "just use the character's name as the title" trend
But without this film being a continuation of a prior story, there's no frame of reference for the audience aside from the subject of the movie, which is obviously Han Solo.
It's no different from "Rogue One: A Star Wars Story" in that it rolls nicely off the tongue and literally is just the name of the subject of the film (in Rogue One's case, the group that stole the Death Star plans; in this case, fucking Han Solo). Except Rogue One's characters didn't exist before, and Rogue One is a group, not a singular person.
I am not sure how eager audiences are for a Han Solo that isn't played by Harrison Ford.
In fact. I'm not sure about Lucasfilm's whole approach to their Star Wars slate thus far. Force Awakens and Rogue One both worked but how much of an appetite is there for all these origin stories and adventures centred on classic characters, long term, remains to be seen.
I feel like Han Solo and Obi-Wan are good subject choices, but I'm not a fan of the Boba Fett idea and I'm struggling to think of any other character for whom this idea would work. Some people have floated Yoda, but I'm not really interested in Yoda's growth and development as a character.