This should be decided only by you, in this matter you can advise what they consider interesting for themselves. For myself, I think you need to believe in ETH and invest in it as much as possible!
Yes, I agree with you. ETH is a good choice for investment now. I have bought some ETH and waiting for a lower price to buy more. Beside ETH, I think NEO, EOS, ADA, XLM are also good.