So I have a command block creation, which makes Minecraft significantly more realistic and challenging, actually feeling like a serious survival game.
The changes to the game are as follows;
You mine significantly slower, even with a tool, forcing you to rely on explosives for quick block breaking.
Undead mobs (except Phantoms) do not burn in the daylight.
All mobs have more health, and have a faster movement speed, able to keep up with the player if they try to run.
You cannot eat raw or rotten meat.
All players must disable nametags in the settings.
You cannot respawn.
This is a much more challenging and immersive experience, however, it is not for everyone, as some people are too impatient to cope with the slow mining speed. If you would like to try it out with me, leave a comment and I'll private message you the realm link.
I have a Java Edition version of this command creation as well, which is better than the Bedrock one, however I currently do not have realms on Java edition.