That's normal, the 4K from the A6700 is serious stuff and it eats up a ton of space. Proxies are honestly your best friend, I do that all the time in my projects and it changes everything for editing smoothness - you work on 1080p or even 720p while you're editing and render in 4K at the end. Otherwise you should also check your codec: if you're shooting in H.265 it's more compressed than H.264, that can help you out a bit. With your RTX 4060 you're really gonna feel the difference with proxies, without them you're just gonna spend your time waiting for previews.