Hello,
VFT'S are fast growing, but slow to mature. It may take another 2 to 3 years before you get full size traps. VFT'S usually from seed take 3 years to flowering stage. I believe it is 5 years to full Maturity.
If you have it in a 3 inch pot now and it's a single plant, that should be sufficient size for quite awhile.
I would repot it in fresh media after every dormancy, however.
This will help keep the soil PH low which they enjoy!
This is a hobby of patience; if you want instant gratification, order a double potted mature plant from this site like I did.
Hope this helps.
Gary