Scam, death both have in altcoins market so why you want investing altcoins?
Profit.
I guess most of the investors out there (including me) are investing into altcoins for the sake of profit, and nothing more. Maybe there are some who wants to show their support towards the project thru holding their coin, but most are because of profit. Scam, and death are more likely to happen in new projects, but for the projects that are out there for years already, the chances of it to be either scam or dead project is way lesser than that of new projects.
My opinion buy dip and sold faster on some profits like to be best revenge for all altcoins investors!
What's your skills and opinion?
That's very easy to say, but the question is can you do it in real time?
It's easy to say "buy the dip", or "sell on top" etc. but the reality is you don't know when it will happen, and by the time it happens, you might lost your patience already and bought at a wrong time.
As for me, I don't have any skills at all. I just invest, and hold it for long term. I don't know TBH if I have skills that would've help me in investing. As for my opinion, there are some altcoins out there who are important still. Bitcoin isn't a one size fits all type of cryptocurrency where it all has the good features already, and that's where altcoins shine. There are some altcoins out there who are covering what Bitcoin can't do. For ex. transaction speed. Bitcoin's transaction speed is slow that's why we are seeing altcoins that has a faster transaction speed as an alternative coin to be used when transacting.