For me, it would definitely be buying a large piece of land a few years ago for so much cheaper than usual. The chance is still there but it's a bit difficult now that I have a child. Will definitely work on it again soon!
Working as a language tutor abroad. It was a post college program my University offered to select students, but I turned it down because of the expenses. I could still do it, but I'd rather be a tourist tbh.
I should have started with other businesses a few years back instead of just splurging my capital on some material things (that I no longer have). I had a ideas that I was too scared to start, and now I see people doing that same thing. I could've jumpstarted the idea all along. But no worries, I believe in right timing. Everything happens for a reason, and I know I am in a great place