Build a new world without building your own PC. The best pre-built PCs for playing Minecraft don't need to be particularly powerful. Minecraft, at its core, doesn't require a lot of computing ...
It's not uncommon for major brands like Alienware, HP, and Lenovo to offer quality pre-built PCs ... reviewers alike. The Legion gaming PCs are highly rated for their build quality.
You could build a PC from scratch, which can be cheaper than sourcing a pre-built desktop, but not everyone has the skills or confidence to source individual components and put everything together ...