No slime in slime chunk?

I built a slime farm for Bedrock in Minecraft Bedrock, from a tutorial on YT. I built it and now no slimes spawn at all. I waited hours and I got 30, and now I've waited another 3 hours and now there are no more. When I emptied the chunk, a lot of slime spawned, but now none are coming.

What farm did you build? (Link to the video please)

Do you play on a server If so, how many people are there so on?

I don't play on any server, I'm alone in my world