Based on what i researched and what the companies will offer, i think these 5 will go massively up in the coming 5-15 years:
VET, XRP, ADA, LINK, TRON and APL (Apollo currrency)
Thats the ones i will put my hard earned cash into... Who knows maybe i can retire earlier than with age 67 ;-)
Out of those I like VET, ADA, and LINK. I guess XRP will always be interesting and I don't see it going away.
Tell me more about APL.