If you think that latter part is easy, then you should definitely go clone a SaaS and exit with millions. You have all the tools at your disposal to clone any app that you want now with minimal effort. Be a 1 man team, no overhead. Undercut on price and exit.

In fact, it's not that easy. The second part -- GTM -- is the hardest part; even if you could clone Notion, getting that product in front of customers is the hard part.