Can someone suggest how to solve DP problems. Whenever i try to solve DP problems I somehow get stuck and can’t even figure out what could be the possible approach. As an example I was trying this problem

I was not able to solve. It is getting frustrating for me now. Every time i loose myself and tempted to look at the editorial. Can anyone please help me out what i could do. Because, i really want to improve on this area. But i always get stuck.