I think it is. Why not try? Remember giving up is always worst choice you can make. I had break from crypto too, I sold all my coins (NAV and few others) back in 2016 and realised in 2017 NAV was 2$. Mining will be hard but possible if you have money to invest in good mining ring. I have a friend with 7X 1080 Nvidia's and he is making profit in Poland for sure using wwww.nicehash.com

I have 2X Radeon's 270X and I mine only crypto only few hours a day, my work commitments (mixed shift patterns) not allow me to run miner 24h. It's a couple of dollars only for 2 weeks mining.

On the other side investing in ICO's or coins is the way to go. Bitcoin is slowly rising too.. Price predictions are 7500 then 10.000 I know it sounds crazy but last time I heard that about 2000$ price. I personally invested small amount of my monthly  income in few ICO's - and I will keep them for long term and I might get rewarded one day. Stick to rules not invest amount you can not afford to lose and you should be just fine.