A pic of your colour would be helpful!
I'd say do one full head henna with a lower lawsone content,to give your hair a coppery base and then build up the intensity with glosses,or henna/cassia applications.Or not,if you'll like the colour.
ETA:You're hungarian?
Is hennécolor henna sold in your country?It is here in Slovakia,and their copper shade gave me a very similar colour on ash brown hair.
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