What’s your philosophy?
What I mean is that:
Philosophy requires assumptions, otherwise it goes nowhere.
An assumption does not need justification, indeed justification itself requires assumptions.
An assumption is like an axiom, it is true within the system for which it is an axiom/assumption. hence each assumption creates a different system or paradigm. Though this is not to say that one system cannot have many assumptions or axioms.
One can then explore that system to see what implications it has and whether they tally with one's experience of the world.
Too much of what passes for philosophy makes implicit, as opposed to explicit, assumptions. It then proceeds to explore that system in the mistaken belief that that system is objectively 'true' rather than merely a paradigm that is founded on assumptions.