If I delete a 21 fields do I gonna lose all data?

Hello
As its production data I'm making sure....
We have a Z table with 83 fields, well. And currently there are around 50 entries in production in this table.
In 1st step: Now, as business scenario got changed, I have been asked to delete the 21 fields from this table, we are aware of that we gonna lose data for that specific 21 fileds in already existing entries, but we want to make sure that we not gonna lose all 50 entries completely and table count gonnna be 0!
In 2nd step: I need to add 27 new fields to this tbale....pls. let us know in this case as well that do we gonna loose data completely?
Pls. share your thoughts
Thank you

Thank you, yes, am not touching the key fields.
But, the yet to delete field's position is in the middle, I mean, 1st field is at 14th level/position, 2nd field is 17th level, 3rd field is 42nd position, so, even though they are in the middle of some fields, it is OK/safe right?
Regards

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