Jolly said he’s still taking suggestions before the upcoming update. These are a couple of things I’ve been thinking of for months now.
Make diamond armor set consist of chestplate and leggings only. Diamond armor is extremely OP in combat; nearly impossible to kill. Removing the helmet and boots will reduce the amount of damage it takes. Of course, players could mix it with iron/chainmail armor but that’s their choice.
Make snowballs less abundant. 2 snowballs for 1 emerald instead of 6. Snowballs have extraordinarily overpowered knockback and combo ability. They should be harder to take advantage of, similar to how the developers made the bow + arrows more expensive.
Add a new block more durable than endstone. I think obsidian may be slightly over the top though. As most of us know, Bedrock has LOTS of younger kids playing, and the obsidian will probably frustrate them. I was experimenting and diamond blocks take about 6 seconds to break with a stone pickaxe, but 1.5 seconds with an iron pickaxe. The developers would have to code them to be uncraftable though.
If I have more ideas to add I will do so unless a developer responds with their judgement.