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His value is quite low at the moment, normally you do not see Barcelona players be this cheap, but he is quite cheap at the moment. At the end of the season, he might leave for another team and get better playing time.
However, let's not act as if Barcelona didn't give him a shot, he played in some games and he was expected to do a lot better in the past as well, all of which resulted with either bad performance or injuries which caused Barcelona to plan around him and not include him. If he can stay healthy, he is still a young player and could have a great career somewhere else, he is only 22 years old and he has been around for a long time. So if he really wants a better career then I would say Ansu should go to another team.
Right now Ansu Fati value is quite low because he's not doing good. His performance rate is absolutely declining due to injury. His current value is lower than €15 million which is literally too cheap for such a kind of player. In 2020 he was considered to a wonder kid of the year, and also at the time his value was 80 million but soon he lost his momentum due to injuries. And that's why now his value is too low, although he is La Masia graduate player but can't find any way to continue his best in a Catalan jersey.
Besides that, Barcelona are no more interested in him; they want to loan him like Hansi Flick only prefers to use solid players. Despite Ansu Fati physically not being too strong. So maybe a loan move would be good for his career.