Spoiler alert.
It means the statement that "it's meaningless" is, in itself, meaningless. That liberates you to construct any system of meaning that you like. But that freedom can also be quite frightening and anxiety inducing.
If that is the case, then you have a couple of choices (broadly speaking):
1. Soothe the anxiety away with opium, doom scrolling, religion, career, keto, multi-level marketing, or whatever. After all you are probably struggling to survive and assert ones own existence, against a backdrop of other fears which are much more realistic than abstract concerns about meaning (eg. losing one's job, income, looks, etc).
2. Rely on a social fabric of emotionally supportive family, friends, significant relations in a context of peace, freedom, financial and job security, your own physical fitness, and other stabilising, fear minimizing, forces which free up your emotional resources to let you focus on not just finding your own meaning but to create a collective meaning in connection with others who are, themselves, meaningful to you.
To be clear, I am not dissing, opium, religion, careers, or even keto per se :) I think those things are all fine if enjoyed in the proper context.