Stick with happy & uplifting Keys -
D major, D# Major, E Major, G Major, G# Major, F# Major
MAKE SURE YOU STAY IN THE ****ING KEY FOR EVERYTHING. That includes your Kick, Bass, Melody, Drop etc etc...
A good tip for a happy bass, Combine Root and 5th note.
Something to remember, Keep shit simple until you get the hang of it, No one starts making hits, Listen to Zedd's, Calvin Harris, Nicky romero's, hardwell's first productions they all sound like shit but with time you learn.
Few examples -
E Major
G# Major
D Major
https://www.youtube.com/watch?v=IcrbM1l_BoI
D# Major
https://www.youtube.com/watch?v=IgGjUjQRAxw
How Keys works, WWHWWWH (W = Whole step, H = Half Step) FOLLOW THIS PATERN.