At/On confusion

[Hanifasmm]

Hi,
1. At your next appointment as the chief of finance, you can do a lot to our workers.
Is the above preposition 'At' is right?
Or Should I change it into 'On'.
Please explain.
Let English native answer me.
Thanks,
Er.S.M.M.Hanifa

[Beeesneees]

The presposition 'at' is correct in your example. Well done!
However:
"you can do a lot to our workers"
should be
"you can do a lot for our workers."
or
"you can do a lot to help (or support) our workers."

If you just use 'to' without the additional word, then it implies that you will be interacting directly on the person's body or mind.
"The hypnotists did something to him which calmed him down."
"The violent man did something to him which hurt him."
_________________
Cheers m' dears!