Get a good lock. These “Steel U-type” are pretty hard to break, even a good ‘steel-chain’ type lock will be more than the average bike on the street.

There isn’t a standard technique yet, but may-be your municipality or police department has a bike marking system which would basically makes the “stolen bike harder to sell”

These 2 things together would limit the risk as your bike is now hard to steal, hard to sell so they’ll go for another one.

Also, can you park your bike in a locked place ? Like a bike room in your appartment building or your house entry-hall ? Not having it outside most of the time also limits the risk

EDIT : Realize that I made the steel/steal typo