I agree with Gary; the sentence starts falling apart in the middle. I think the phrase you meant was "more money than ever before". The sentence needs to finish there. The word "zenith" isn't very common, and the preposition is wrong. Because a zenith is a point (literally, the midheaven; figuratively, a peak or most successful moment), you must use "at". I don't know what you mean by "tender" either. Do you mean something like generosity?

Hi, No, it's not really. Zenith should not have a capital, or a possessive. People don't really have zeniths. I can only guess what you mean by 'tender'. Do you mean something like youth? We don't use it like that. It also needs a bit of rearranging - perhaps ...ever, even before he's reached the zenith of his career.

I shouldn't say before here too , should I? because I already said ever