i also think it's worth keeping in mind that, while i love dark humor as a coping mechanism, there can always be too much of a good thing. if a thick layer of irony and jokes is keeping you from connecting with others, it's a bad thing. if you feel like you can only interact with others by being The Jokes Person, that's also a bad thing.
humor is often a defense mechanism in that it's how we keep from feeling vulnerable - but we can only make true connections while being vulnerable.
but also honestly i've seen a lot of people who cloak themselves in irony, in jokes, in shitposts, and then in the rare moments of sincerity talk about how they feel disconnected, unsatisfied, and lonely - and exhausted because they feel like they must be "on stage" doing their bit to be loved.
humor is sometimes a way to feel safe. but you can sometimes be, in essence, too safe.
opening yourself up and being vulnerable is fucking terrifying.
but it's also worth doing.
so yeah, if you feel like you have to cw for being sincere, i would say (in all my armchair fuckin quarterback glory) that maybe it's time to take a step back, recalibrate, and examine how you're doing. sincerity is how we connect with others on a fundamental level. sincerity is recognizing your gestalt whole, not just one aspect of yourself - the Jokes, for example - connecting to someone else's one aspect.
and yeah, i struggle with this shit, too.