Indiscriminately firing federal workers whose salaries will collectively make up maybe one tenth of one percent of the budget is not at all about reducing debt, that's just the thin justification they are using the destroy any independence and competence within the government that might get in the way of their looting and corruption.
Anyone who thinks that Trump and Musk are serious about reducing the federal debt at this point aren't likely to be swayed by anything I say. But for anyone who genuinely believes that I hope you will look at what the national debt and deficit are right now, and then to check on them in a few years when both are dramatically worse. You will find that two of the most prominent bullshitters in the world are in fact bullshitting on this topic as well.