How do you think following that advice would have impacted the path you have taken in your professional life?
Even if time travel was possible, 20-something me might not listen to 40-something me. She stubbornly had to learn everything the hard way. If I somehow got her to hear me out, I'd tell her not to wait for the "perfect time" to do anything. There will never be a perfect time. Just start doing the thing you want to do, and do your best. There will be times when you have more energy and resources, and times when you have less. Regardless, just keep going. The catalyst for several of the very positive things that have happened in my career has been relationships, so doing certain things earlier or not doing something "irrelevant" to data might have prevented those connections, too, so I don't know what impact my advice would have had on younger me. I genuinely think everything I've done has led me to right now.