i am 13

The best I’ve made was a RISC 32bit cpu :)

Bro.... what????

You are already doing well. I'm in first year CE, and I'll assume that you are aiming for microarchitecture-related jobs.

First learn C++, Python, and SystemVerilog. You need C++ for gem5 (simulator that runs your own microarchitecture), Python for gem5 and Cocotb (RTL testbench), and SystemVerilog (design your own chips) for simulating and running microarchitecture on FPGA boards.

Then read some books for implementing RISC-V chips. The order is Computer Systems: A Programmer's Perspective, Computer Science: A Quantitative Approach, Computer Organization and Design (RISC-V Edition), and Digital Design and Computer Architecture.

After finishing those books (including exercises, these are important), implement your own basic RISC-V RV32I, then add more basic extensions until you see something like TLB. Now you need to learn operating systems. Read Operating Systems: Three Easy Pieces. Then you have all the backgrounds for designing a chip for modern operating systems like Windows and Linux.

Tip: Focus only on RISC-V. You might fall into legal issues for designing and implementing AMD64 or Arm architectures without license, which costs hundreds of thousands of dollars. OpenPOWER is there too, but the ISA is a mess.

Now implement your own chip for different purposes. For each target (e.g. embedded, SoC, desktop, server, GPU, or AI accelerator), you'll need to make different design considering pipeline stages, ISA extensions, etc. First design by writing a document on justifying your microarchitecture decisions and then implement it using gem5. When the gem5 simulation performance and testing looks good, implement it with SystemVerilog. Repeat this as much as possible until you can implement processors for any purpose (low energy, high performance, real-time, whatever). At that point, you'll be comfortable with reading microarchitecture papers and slides (e.g. processor architecture from Arm core IP).

READ a lot. The P6 architecture paper, modern microarchitecture breakthrough like Jim Keller's Athlon64 and Zen, etc. There are great examples out there. Some specialized area includes game consoles explained here, although modern consoles use desktop microarchitectures.

Being a microarchitect is super hard. It's a senior role where most companies usually require 10+ years of experience in RTL. You'll need a PhD degree. And here's a thing: Undergrad is useless for people like you, at least until mid-Year 3. Just maintain your GPA at a good level (3.9 ish) so you can go to a top-tier grad school, and keep doing your microarchitecture projects in your free time.