The bigger problem though is that this sentence sounds more like you are saying ''I won't do anything yet'', because htjeti/hteti followed by an infinitive verb is how you form future tense.

To remove the ambiguity, it is better to use želim in this sentence. So a better sentence would be more like "Ne želim još ništa raditi"
Would it also be right to say: "Neću da još ništa radim" ? Hem, not sure about the word order either...