"On my own initiative" is a fixed expression using the singular "initiative," and treating the noun as uncountable. When you say "work on my own initiatives" the meaning changes completely. The noun becomes countable, and the implication is that you have a few pet projects of your own, and you worked on them when you were supposed to be working for the company.
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crespo"In my position as an Assistant Technician, I had the opportunity to work as part of a team, co-operating I prefer this word without a hyphen - cooperating) with others and at the same time being independent.Often,I was often (I have a slight preference for the adverb to be placed following the verb, instead of at the beginning. Both are acc