From a development point of view, the govt should concentrate on those states that are guaranteed to remain with BJP, along with letting TN, AP, KT, TL and MH continue to develop. Madhya Pradesh and Odisha should be the biggest priorities going forward for the central government in new infrastructure projects, educational institutes, and attracting investment, in conjuction with the state governments, since these states have been backward for a long time and need to catch up. The addition of Odisha is an especially welcome one since it's a coastal state, which has a LOT of potential if they do it right. They should further double down on Gujarat, as that is the safest state for long term growth and political stability.
The rest of the states are gone cases where development does not translate to mandate, which means there is no incentive from either end of the political spectrum to wasting resources there. Use them as labour pools and give freebies to keep their bellies full, but put real effort on development in the above mentioned states.