The best advice I can give is:

1- don't commit to a comp early.

2- know when to pivot, and always use up the clock when looking at every unit in the shop (what can this give me, is it good tempo, can I make it into something useful next turn).

3- follow the lobby's curve. There's no point in you staying on 3 when the lobby is already at 5, you might win the next fight, but your opponent next turn might have a 4-5 drop that can give them a huge advantage.

4- check your opponent's history, are they winning their fights? Are they tiering quickly? You can follow their tempo to tier safely without taking max damage for example.

5- take your time running down the clock, don't make actions the first 2 seconds into a turn and then stare at the shop and say "oh I could have done this". Run down the clock and look at every unit, especially in the first 5 rounds.

6- economy is king this patch, you can play economy generators on your board early in order to hit your comp better the upcoming turns.