This may sound banal but if one wants to be happy, one must do things which make one happy. If one enjoys what one creates then, success is very likely to happen. The one doesn't exclude the other - they are not opposites. The goal should not be to become happy, nor to become successful. Most important - and this says also the LOO imo - is to become a true realization of oneself. Know yourself, accept yourself, become the creator. When this happens, success - e.g. earning a lot of "money" - can also come.
But this is easier said than done... ;-)
But this is easier said than done... ;-)