My personal thoughts on the matter:
Operating under the following definition of free will: "the ability to make choices (choices as in "conscious activity that is of a variable capacity to be"😉", and assuming the validity of the foundational knowledge that my argument relies upon, as well as the adequacy of my awareness as it relates to the process of analysis, objects of thought and function with variable capabilities have free will.
Free will exists in this scenario as it is thought and function that can be said to directly determine the activity of such an object.
That there are alternative determinents of the activity in question is an irrelevance that simply highlights the point that there are multiple perspectives from which an issue can be observed and an object can exist. From the appropriate perspective (from the perspective of the material world, free will is a meaningless concept), that which gives meaning to the concept of free will, that is, from the domain of the mind as it has been outlined, free will is the direct cause of conscious activity.
That there is only a single predetermined form that the universe can take at any particular point at any given scale, including the choices that can be made and the design behind the aforementioned 'objects of thought and function with variable capabilities", does not prove incompatibilism (the concept of material determinism or the idea of destiny would not even be required to those ends in the first place - conscious activity that is of a variable capacity to act, if assumed to itself be of a deterministic nature using the beginning existence of the mind as a point of reference, would in itself only ever interact with a fixed constant in a single given manner), as free will as it has been
outlined here concerns itself with the variable capacity to act in alternate hypothetical scenarios with respect to the function of the object of thought, not in reality with respect to a single given function and a fixed state of the external environment. Free will concerns itself with the freedom of the individual, and it is only because the function of thought, which predates free will in the choice making process, is fixed, that choices are fixed. Function does not restrict the freedom of the individual, it in fact largely defines the individual. Individuals have free will because the elements that define their existence, from its very beginning to its entire timeline, determine how their variable capacity to act is realised through conscious effort. Fixed outcomes do not disprove freedom, but in fact confirm how freedom is utilised in the face of fixed factors at play.
Other notable counter arguments, without going into specifics, for the most part suffer from errors or intentional distortions of equivocation, and I'd appreciate it if you were to pay attention to the exact definitions I'm operating under and I'll gladly clarify where such indication hasn't been given so that we can minimise the potential for such errors for this particular discussion.