Avoid the rewrite reflex
Legacy software often contains years of operational knowledge. Modernization should preserve what is valuable while creating cleaner boundaries around the parts that need to change.
Find the expensive seams
Start where change is slow, defects are recurring, integrations are brittle or user workflows create measurable friction.
Modernize in controlled slices
Improve interfaces, data contracts, test coverage and deployment boundaries in stages so the business does not have to bet everything on one cutover.