You must look for the coins potential if it will be able to sustain its needs for a long time. Also check the backgrouns of the developers if they have been part of some successful project for you to check if they are legit or scam. Also check the current market movement if the value of it is good to invest to or not.
Also consider the current trend of the market, do not go for Altcoins make your investments with Bitcoin because it is more stable and trustworthy in crypto market. Before investing have a full command over the knowledge of market, its working and the most adopted strategies. Choose the way that best suits you, you can also take guide from other successful investors.
From all that we also need to examine the project more deeply, because projects with reliable development of real products that are owned, then of course it will add higher value to the project to be able to work for the long term. Any coin has a specific project and purpose so we must consider it even better to invest so that we can avoid scam projects, even though it is difficult to obtain but we have made every effort possible for the good end.