Free will and destiny are ever existent. Destiny is the result of past action; it concerns the body. Let the body act as may suit it. Why are you concerned about it? Why do you pay attention to it? Free will and destiny last as long as the body lasts. But jnana transcends both. The Self is beyond knowledge and ignorance. Whatever happens, happens as the result of one's past actions, of divine will and of other factors.
There are only two ways to conquer destiny or be independent of it. One is to enquire for whom is this destiny and discover that only the ego is bound by destiny and not the Self and that the ego is non-existent.
The other way is to kill the ego by completely surrendering to the Lord, by realizing one's helplessness and saying all the time, 'Not I, but Thou, oh Lord' and giving up all sense of 'I' and ‘mine’, and leaving it to the Lord to do what he likes with you. Complete effacement of the ego is necessary to conquer destiny, whether you achieve this effacement through Self-enquiry or bhakti marga (path).