Why did Jedi do after Naboo Crisis as little as they did?

At end of Naboo Crisis, Jedi order believed that Sith are back. But why did they do so little?

I mean, for example, they did not interrogate Nute Gunray, because republic administration did not allow them such.

But why, for example:

- they didn't set couple Jedi Shadows to monitor him, and Trade Federation leadership, since they knew TF has been already compromised by Sith - recover Maul's body - even if they had no reason to suspect he is alive, doing autopsy on his body should let them know a lot more about Sith than they did (such as where Maul originated from, which would give them lead to place where Sith operated at some point) - consider all previously employed methods to detect presence of Sith to be either bypassed, and/or compromised, and then fix them, and find new methods (yes, force should tell them, but since it didn't, Sith learned to bypass that) - start paying more attention to what is happening around in galaxy, since Sith were able to not just operate by themselves, but get an entire supercorporation to throw their weight to besiege a planet for some unknown goal. Who else dances according to strings held by Sith?

Or if they did investigate, what they did investigate instead?

It feels like they have effectively been delivered proof of Sith existence on a silver platter, after a jedi master died to deliver it, and they did effectively choose to file it as a historical curiosity and continue as usual for ten years, until a new piece of evidence is literally shot at them. (when Jango shot dart at them that let them find Kamino)

Not saying they should have been able to actually find sidious, but what were reasons to not do these things?