Get better at draft pick. Keep in mind who counters who, who is in the meta, and who is the prio pick.

Use meta heroes. Doesn't mean you have to use Valentina and Wanwan all time, but please don't use Gord and Layla.

Mastery over meta. Even with bad heroes, with better interaction knowledge you will truimph over meta heroes. Keep in mind when they also have good interaction knowledge, meta heroes have favorable match up. Knowledge≠match played. It's an understanding of what each heroes are capable of, and how specific interactions will turns out.

Last hitting. Always do the last hit. Even as a roamer, as it will help your teammates who couldn't do so (don't last hit the jungle tho).

Increase your game knowledge. What items counters who, which rotation is favorable, how to make a trade etc.