Same my previous phone had updates almost every 4-5 months and because my phone is not receiving any updates it's starting to become buggy.

If I don't get any update this month, I'm switching devices and not getting a Samsung device again

Yeah, some of us are experiencing the same thing. I contacted Samsung support, and they said the One UI 7 update is still rolling out for all Galaxy A55 devices. So we just need to wait for the software update notification to show up.

Lock screen?

I think u will get the update within June