I posted this in another thread - a good general place to start BEFORE building out your new network..
https://docs.hubitat.com/index.php?title=How_to_Build_a_Solid_Zigbee_Mesh
https://docs.hubitat.com/index.php?title=How_to_Build_a_Solid_Z-Wave_Mesh
Also you can keep some of your ST stuff around if needed and use the community app HubConnect to share devices between ST & HE (and also HE & HE).
edit: to give proper credit @aaiyar is usually the one mentioning these!
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