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.
Buying top coins doesn't automatically means that you'll make profits, you can buy top tokens that are trending but tomorrow they become worthless or go out of the top tokens position because new projects has moved up to top position. For example, if you look at the top coins that were in the top position for last bear market, only a few retained their spot during he 2021 bull market.
Old project aren't the best investment, new projects aren't the best investment as well because nobody knows the best investment but to increase your chances of gaining big profits in the bull market, you should go with tokens that has more risk but you know is a legitimate project and that's the newly launched project because they still have room for more growths as they're new.
The only risk of investing in new project is that they haven't been tested so you don't know if they can last for a very long time to invest into them but it's worth the risk since the profits you can make from them is very big. Some of the coins I'm thinking of investing in are worldcoin, Arbitrum and Pepe coin. They're some of the recent ones and buying them now will be a good choice.