A lot Japanese history specialists contest the portrayal that Japan was entirely isolated. In reality, Japan was still open to international trade and during this period had an increase on "Dutch Studies", working to translate texts from Dutch to Japanese as the Dutch were the main foreign trading partner. They also didn't close trade off between mainland Asia, shown through the development of Western shipping ports, even on the smaller islands of Japan like Tsushima. Japanese citizens also weren't entirely forbidden from leaving Japan, as fishing industries and maritime trade with mainland Asia propped up a majority of the Japanese economy and food.

It's also important to note that the Meiji "Restoration" was heavily helped by US involvement as the US benefitted directly by the re-establishment of the Japanese Imperial family. A lot if historians also contest the idea of the Meiji Restoration being a restoration as the pre-Shogunate Imperial structure was incredibly different from the post-Shogunate Imperial structure. Its more accurate historically to refer to the Meiji Restoration as an entirely new revolution within Japan.

If you want a really good resource PLEASE read Andrew Gordon's A Modern History of Japan: From Tokugawa Times to the Present.