I think it’s great you have both outlets. I don’t know what your goals are for writing on Medium — If you need it as an additional source of income, want to drive traffic to your blog or just want to know your posts are being well received. But I think it’s the best of both worlds — you have one site you can focus on your niche and a specific audience while you also have this one where you can experiment with different types of writing and topics and widen your audience to include others.