My tank gameplay has been lacking lately, I dunno why and need help to find out!

Hello, I'm a high plat / low diamond tank, and these last few days my tank gameplay has been quite doodoo. I don't feel like I'm playing very differently compared to before, but I feel like I'm dying a lot more and getting less kills and impact. Usually I'd easily be able to rack up a lot of kills along with few deaths.
These two matches that I'm sending have both been Wide Queue if that matters anything, but again, I believe it's mostly my fault (especially on Havana)
Both matches are games where I feel like I've performed poorly.

Any help and criticism is greatly welcome!

IGN: TobiasF

Havana Game: EZDPC2
Nepal Game: 8HME3G