Which coin do you think would be the best in the long run?
Please recommend the coins.
I don't want to buy for short investment.
There are so many blockchain projects in the world.
What project looks most promising?

I would recommend BTC, ETH and XLM. If you invest USD $, i think it is better for you to invest in BTC and ETH for long term like one or two years from now. If you invest in XLM for long term, it can be more profitable than few other coins. I would recommend you to invest in two or three coin, not only in one coin.
That's good, everyone's were looking for the assurance of having profits in the future and investing this few coins might give us something different.
I know it is quite a risk for crypto investment considering the market conditions but if we would not thinking of making it hard then, we could achieve of what we aim for in the future.