For the moment I avoid new projects, I also don't buy new coins. The only thing I believe right now is ETH and BTC, apart from that coin I am not interested. Holding ETH and BTC is more profitable than other altcoins. If you want to get a quick profit you can trade.
We avoid those new project its cause of these not promises or not trusted project.
And yes ETH and BTC are worth to buy and many of us in here believing on it, And you said this is profitable and that's true because of this two most popular in crypto. Their are altcoins also more profitable in trading but time to find it.
But if we want more different altcoins just checked it already in the market and make sure is have a chance to increase the price in the future.
Most new projects have very little capital and often don't attract the attention of people so those projects will often face great risks. I never choose to invest if the project is not clear and there is no specific roadmap so please consider before making the final option. Now that there are thousands of altcoins available and there are over 100 good projects for you at this time so investing in new projects may not be necessary.