You say 'publicité', so unless the advert is intended to be linked to Voltaire for some reason (and I don't know that many people would make the connection), I see no reason to use a 'translation' when we have an equivalent saying in English: leave well alone.

Of course that doesn't mean 'leave somebody well alone' but leave what is well/good alone (for fear of making it worse).

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Note added at 45 mins (2023-02-07 23:40:19 GMT)
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"leave well alone
to allow something to stay as it is because doing more might make things worse:"
https://dictionary.cambridge.org/us/dictionary/english/leave...

Also said as 'leave well enough alone'
https://en.wiktionary.org/wiki/leave_well_enough_alone#Engli...

Also 'Let well alone' as I pointed out in 2009: "I've always heard and said "LEAVE well alone", but this may be a "modern" variation on the original which a/c to the Oxford Book of Proverbs can be traced back to 1570 as "LET well alone", in which " Well is normally considered [here] as a noun ('what is well'), rather than an adverb".
The answer chosen in this case was 'leave well alone'.
https://www.proz.com/kudoz/french-to-english/idioms-maxims-s...

There's little context to go by, but the headings mention multimedia and publicity. I propose a variation on the theme, with a known standard sentence in the same ballpark, which also means that if something is already working fine there's no need to try and improve it because you may even end up worse off. Others may have better solutions of course (including the literal time-honoured translation)