MSCS for Non-CS Majors - Advice for prep?

[Ariet]

Hi!

I was kind of hoping for a bit of advice.I am currently a product designer and I am more passionate about how things solve problems and less interested in the ascetics so I want to shift careers.

Currently, I am learning python, taking a few undergrad math classes from ASU, & have about 6 years experience in the tech industry as a product designer. I get that I could likely go to coding boot camp to make the switch but I want more then just learning how to code. I want to understand why things work, I want to learn in an environment that would allow for experimentation, & I have a bunch of different interests in computer science so I am hoping that a master may help me narrow down those interest. 

I have a few different options to prep for apply in 2021 since I need more CS coursework and need to be able to code better. For most of the programs I looked at require additional math and CS coursework but nothing that couldn't be done quickly though ASU online. So far, here are my ideas:

1. Go to boot-camp 
2. Get a post-baccalaureate in CS 
3. Do a DIY approach where I use a combo of free/cheap learning materials, hire a mentor, make a few things, take the prerequisites individually 

I am mediocre on paper as a student, I have a 3.1 since I had to work full time during more of college and my bachelors of science is in media and communication so additional course work in theory could bring my grade up but I have about 200 credits so I am not sure if getting a second BS is worth it. I am pretty good at independently learning since everything I currently know for work is stuff I learned on my own time.

I know this topic or ones like it have been posted quite a but I was hoping for specific feedback. Technically this will be my second time applying to grad school but the first go around resulted getting in to 1/10 and me deciding to just gain work experience instead since I didn't get funding.