So to correct one thing:
Poor posture is a symptom of poor core strength, particularly, your rhomboids and lower back. If your muscles are both stronger and more flexible, they will literally pull your bones into the correct alignment, without any conscious thought towards sitting straighter.
Start by taking a short walk once a day (free). A 100 day pushup challenge (free) or starting Yoga classes (can be free on YouTube, but in-person has several benefits, including having someone correcting your form, and some social structures to help provide extra motivation) would be a great next step. Longer term, maybe light weights and rows alongside using a treadmill or stationary bike.
If you choose to look into weight training, “Starting strength” is a decent program by Mark Rippetoe that I would recommend.
What is your degree program? Or, what is your career path?
In general, when people say “Cisco” certs, they almost always mean CCNA, which is the associate level Cisco certification, and gives foundational network knowledge that is highly valuable and transferable to other IT and cyber fields.
Cisco CBROPS probably won’t get you in the door at a SOC without other work experience or certifications, unless the place is super aggressive about churning through SOC I analysts.