Just looked at the blockchain again and it's starting to get crowded, with a bunch of transactions queued in the mempool, like rush hour on the bridge... Clicking send doesn't mean it will be confirmed immediately, it just puts a small note into the queue waiting for miners to pick. The most common situations during congestion are: waiting for a long time with no movement, suddenly getting stuck, or just expiring and getting stuck, and you have to manually add more fees to "push" it up, otherwise the transactions behind the nonce will be blocked too, which is pretty annoying.

Recently, there's been another wave of Meme + celebrity pump calls, honestly I react pretty slowly, it took two rounds of trending searches before I realized the chain was starting to heat up. Veteran players advise newcomers not to take the last step, which sounds cliché, but when I see the increasing ridiculousness of the queue fees, I just want to withdraw... Being a bit more cautious is also good, at least not rushing into congestion head-on.