There's lots of advice to be had out there regarding lowering your chances of CRC, most of which are good for just about everything that might ail you.
You know the drill: eat a healthy diet (which boils down to the so-called Mediterranean diet for most people w/o food allergies, drink only in moderation, get regular exercise, try to maintain a healthy weight, take a baby aspirin, and for CRC maybe a vitamin D supplement. (I'm sure people can and will recommend all kinds of supplements, a subject that many are devoted to.
I would suggest that you look into the stool-sample type tests (FIT et al) and consider taking one every year between colonoscopies. They certainly aren't 100%, but neither are colonoscopies, and they are a lot cheaper and easier and might give you some peace of mind.
F, 64 at DX CRC Stage IV
3/17/18 blockage, r hemi
11 of 25 nodes,5 mesentery nodes
5mm liver met out
pT3 pN2b pM1
BRAF wild, KRAS G12D
7/18 and 11/18 CT NED
12/18 MRI 5mm liver mass, 2 lymph nodes in porta hepatis
6/19 Multiphasic CT LNs normal, Liver stable
6/28/19 Pause Key, predisone for joint pain
7/31/19 Restart Key
9/19 CT stable
Pain: all fails but Celebrex
12/23/19 CT stable
5/19 MRI stable/NED
8/20 MRI NED