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Hi, this question was already asked a bunch of time.
You may look previous answers to it:
https://www.google.fr/amp/s/amp.reddit.com/r/AskHistorians/comments/1t93sj/how_did_the_rest_of_europe_respond_to_the_fall_of/
https://www.google.fr/amp/s/amp.reddit.com/r/AskHistorians/comments/2w2nl5/after_the_fall_of_constantinople_in_1453_how_did/
https://www.google.fr/amp/s/amp.reddit.com/r/AskHistorians/comments/1506ry/what_was_the_reaction_in_europe_to_the_fall_of/
https://www.google.fr/amp/s/amp.reddit.com/r/AskHistorians/comments/37pyfh/562_years_ago_today_constantinople_fell_to_the/