At this moment it may be risky to invest in established Altcoins as BTC price is above $50k too quickly. While waiting for the popular ALT's to come back down so you can buy again at good value it's worth searching for new projects and good airdrops (Airdrops.Io is one website which lists them). Some exchanges also pay to join them. I am also mining on my mobile phone which is free and simple for new coins which may be worth something in the future. If you are interested to check them out they are available on Google Apps and they have good ratings by users, Pi Network: which has 13m users and is 2 years established, you will need an active referral code to sign up so you can use mine if u want and u will get one free Pi to start with (referral code = syedm786). The other is Bee Network, this is fairly new and similar, has around 4m users and only a couple of months old which means u will get a higher rate of coins (referral code: syedm1). They seem legit projects but best u check them out make your own decision.