I'd tell myself not to waste the time, money or energy on college.
I'm not against it in general, but going for a compsci degree when you've already gotten software dev work is definitely a waste of time unless your employer is paying for it. I just let my dad talk me into it after getting out of a bad job. Thankfully I only wasted one semester on it and got out because I found another job.
Still, that turned out to be $4k in loans for just 6 units because I couldn't file my FAFSA in time to qualify for any grants, thanks to my fucking undiagnosed ADHD father who couldn't be bothered to file his taxes or even give me an accurate income required by the form. That was $4k I could have put into savings or invested instead.