Whattup IK, first post!

In my idk how many years of playing, this the 1rd time i post sum on GTarcade, so heres a question:

What is the best troop element and immortals to focus on as F2P considering most of everyone, mainly whales, focus on lightning?Curently, early game i focus water+medb.

I know most of you heard this question a gazillion times, but help a man out here, please🙏!