Run it through some pvc pipe for some environmental protection.
Amazon has 50/100/500/1000 ft rolls of Ethernet cable for $50-$200 & you can make your own length if you want. Crimping the ends is simple
Discussion
Not for Starlink - it doesn't use an RJ45 connector except for the bit you use to bypass the wifi router.
They use proprietary plugs that create a water tight seal.
This is exactly what I did so I could have ethernet and electricity in my backyard shed. PVC pipe burried and comes out through the concrete foundation inside the shed :)