How to say “I’m busy” like a native speaker

How to say “I’m busy” like a native speaker:

1. I’m tied up at the moment.
2. I’m swamped.
3. I’m in the middle of something.
4. I’m knee-deep in work.
5. I’m snowed under.
6. I’m slammed.”l
7. I’m buried.
8. I’m up to my ears in work.
9. I’m in the thick of it.
10. I’m in the zone.
11. I’m elbow-deep in tasks.
12. I’m hustling.
13. I’m flat out.
14. I’m maxed out.
15. I’m caught up.