I was at the same Boat this Season and almost made it to Silver 3 (I'm lacking CP :( )
What helped me the most was a lvl 2 Summoner and a few leveled cards. One point in whatever stat don't seem much but 1 Health could be one more tanked hit to win or 1 Speed could be the final last dodge...
Look what max level Cards are allowed in Bronze and try to upgrade 1 or better 2 Splinters with Monsters to that Level.
Understanding some Tactics for the different rulesets is also Key!
There are also a lot of good Content Creators that help new people like:
RE: Chaos Legion Lore: Burning