Might wanna try a ternary model, which are a lot denser in comparison.
Ternary Bonsai 27b is 7.17GB in size, which might fit on your 3070 depending on how much free VRAM you have (and with CPU offloading it should work in all cases). You can also try their edge-computing model designed to be working on smart phones here - that one is less than 4GB in size, which should fit in any case. In my experience they do work very well compared to other models in that size class.
Be aware that they need a specific llama.cpp build found here
anamethatisnt@sopuli.xyz 12 hours ago
Gemma 4 12b unified as a q6 gguf fits with about 24k context inside your vram. koboldcpp+sillytavern works well on the software side.
laz@lemmy.dbzer0.com 12 hours ago
Sc117