Sometimes in a world, you start in the nether, a dangerous place with strong mobs,

1.Search for a forest biome; Example: Crimson and warped forest

2.Craft wood and wooden tools

3.Make a trip for Basalt Delta biome, mine some blackstone

4.Craft stone tools with blackstone and scavenge for better gear

5.Raid a bastion remnants for netherite

6.Grab all the obsidian you need and scape to the overworld.

7. Good luck.