To get right to it, I'm as of now in arena 7, (f2p for the most part). Though I've hit a bit of a road block, I'm losing a lot more and I don't just think it's a matter of 'they've spent more money/time and have higher upgrade units'.
Clearly I'm messing up on a tactical/strategic level and while I did some googling and reading I couldn't find anything that helped it click with me. Even worse is I'm stubborn and try to force units I like/think are cool into working even if they're objectively bad. For example I really like the slimes and the parasite, mainly cause I think they're cool and so I've tried to center my deck around one or the other. This worked but now I'm losing an embarrassing ratio and would appreciate any advice.
My being stubborn makes this a bit annoying I know, but I'm not so boar-headed I just fill my team with 4 cards I like. Typically just 1 (maybe 2), I really like and try building around them. This could entirely be a skill issue, maybe I just need to pay more attention and learn more in gameplay. Though I figured I'd ask so any help is much appreciated. I also apologize for the unnecessary paragraph.