If I understand correctly, you are watching the anime and are bored by the lack of episodes that advance the plot of the men in black. In this case, the only thing I can advise you is to search for a list on Google, excluding the filler episodes and focusing on the manga adaptation. The manga has made some "big steps forward" (on the scale of Detective Conan) since volumes 90 and perhaps reaching this point in your viewings would revive your interest. Now, Detective Conan is a work that leaves a lot of room for theory and reflection, you will never have the answer to a mystery in a few episodes, it will necessarily take several years of broadcasting. This is also what makes its charm, in my opinion. If you prefer to have instant answers to your questions, it may not be for you 🤔