In my 50's now, have worked for myself since my 20's.  My businesses are across several in person industries - tech, global art, global art education, tabletop gaming, and global event management (1 event/mo).  The industries and product/services I serve compliment each other in varying ways, while allowing me to pivot when an industry has a slag in global performance (covid was brutal in events, but tech was running overtime to keep business's going).  My time is my kryptonite - I build my businesses to passive with teams and systems I can trust, to keep them going without my daily governance.  I have also been willing to stop several new businesses that were not going to ultimately perform in my portfolio - they are never a "loss", but quality control for overall performance & always a learning experience.
"Stacking" has been my key to success. 
I'm now putting energy into a passive income online business, and your videos are absolute gold.  I can see so much potential and can't wait to kick off this new business adventure - thank you.