A lot of people seem upset about the meta right now, but I think it's mostly just set fatigue. The meta is pretty varied right now, there's a lot of viable top tier decks. There's even more decks viable for climbing on Arena efficiently. To be honest I thought I was wrong on this, but I was watching Reid Duke play today and someone asked him about the meta, and he said he thinks it's quite varied right now and in a good spot. I get the frustration though, the meta currently is about huge swings in momentum. Whether in aggro, control, ramp, or combo. It can be frustrating to lose hard in a turn or two and feel like there's no way to dig yourself out.
What helps me is to limit my play on Arena to just a couple hours every day. I get tilted less often. Also if I don't feel like playing, I don't play. It's easy for those daily/weekly wins to get you in the mindset that you have to play (and WIN) constantly, which leads to frustration when you don't win. Play when you want to instead.