I think old project will be the best investment for you and you will never be disappointed with those projects because the best tokens always guarantee investors. Also if you want to hold for longer then definitely buy early top coins. If there are any profitable services offered by them, participate in them.
I don't think that's so simple. Many of the old coins that i used to hold have died out. It's not easy to keep people hyped and interested when markets are getting saturated with newcomers with exciting new tech.
When your old team might be doing the polishing of the old tech in their free time because money has ran out, there's no money for marketing and listing and whole thing is just a hobby for devs. Even community takeovers have almost always turned out as a horrible idea.