Buy high
Sell low
Invest in dogecoin
Do not invest in any altcoins, I think gambling is more 'secure' than investing in alts. Instead save your bitcoin, do not buy anything unless you rally need it because bitcoin price is right now rather low so I would advise you to wait for some price rise. And then buy something.
You are right, man, I am the best example to prove your view.
I lost over 80 btc on altcoin trading, it destroyed my life. And most of them are shit, devs are scammers, they just wanna our bitcoins. Most of them are pump and dump scheme, big whales are stealing investors' money.
While I earned over 10btc in gamble, so I prefer to say, altcoin is the real gamble, but gamble can for fun and make money.