I would go for coins that have solid roadmaps that are being hit.
Coins such as ADA should increase dramatically in 2 years time as they become more mainstream, and are seen as a "V3 Blockchain" by many.
NEO is also a good one to hold as you have mentioned, you get GAS as your interest which is a great benefit.
Well the crypto has this magic that if you invest in long term and hold it foe almost a year or two, the whole scenario changes and the worth of your portfolio rise high. The rise in the worth of portfolio occurs because of the fact that even little appreciations in the value of alt on daily basis adds to the overall worth. Besides, an investment right now will be more fruitful because there have been positive predictions and good speculated price about altcoin.