The last 3 games I’ve had over 15 kills in the first half and then in the 2nd I get less than 10. Idk what’s happening how am I so inconsistent and how can I fix this

i've been playing for a couple months, although i'm still not very good. i had to stop playing for a little bit because my sisters were visiting and i started school. i'm playing worse now, that one i understand and i'm trying to improve by...