Everything we do in life takes time.
Some of these are a good use of time.
Almost nothing we do is a waste of time if we reflect and avoid repeating mistakes made.
To find if something is worth your time or not, look at history and look around.
See who tried what you are trying to do and where they are now.
Are there patterns that you see?
If you are doing something novel, then just see how deep is the downside and how big is the upside.
Also, look at how much you’ll enjoy this thing and decide. What is worth doing may not be enjoyable always, so add other layers of info before you decide.
In the end, avoid anything that won’t give you a second chance.
Rest all is worth a try.