Two new features are coming to Salesforce Flow in the Winter ’22 release:
1) Sub-flows support for Record Triggered flows. Only available with after-save flows but they permit reusable sub-flows, reducing complexity and improving debugging.
Break large flows into more manageable parts with subflows also move common functions into subflows. Eg if you have a common pricing algorithm, create it as a sub-flow and reuse where you need to calculate pricing.
2) Custom button labels. Now you can give your flow buttons any name you wish.
All this and much, much more coming in the Winter ’22 release.