Let’s say there are consequences where all genetic alterations are difficult to sandbox and largely irreversible during an extended, but still finite lifetime of around half a millennia.

Rules:

• changes will be passed down to your offspring
• any change may make you sterile, but large changes will always make you sterile
• alterations are most effective when done under the age of 20 and do not fully manifest for decades
• if you screw up your code it might be deadly
• biology as an engineering corpus is several orders of magnitude more complex than computer science was in the 21st century – screwing up is very easy
• any adaptation present in evolutionary life is technically possible to someone dumb enough to try and brilliant enough to pull it off

These are the rules, what do you change?