What’s your strategy for selling vs holding when selling for another type of investment

Hiya all. I've made a little profit and have ended up with a confusing decision to make.

Basically, I want to study web design + coding but I don't have a laptop/PC. I've made enough to cover buying one, but there is a potential for my investments to grow much higher

So, if I cash out I'll be able to get myself a laptop to start studying something which is in itself an investment of sorts that may or may not pay off depending on my success.

Alternatively, if I wait, my investment portfolio may grow and I'll be in a better position.

It's difficult because both options feel like there's gambling aspects to it – I might not get a job out of studying web design & my investments could be unsuccessful

So how do you make decisions like this? Its difficult to weigh up and I appreciate any suggestions

Thanks so much