Yeah I think bitcoin is the safest investment in crypto market. This is because it is the oldest crypto with the most popular adoption among other cryptos, and no one can control Bitcoin. Ether, on the other side, is affected by Vitalik and his team, so are other coins as well.

Is this a right time to buy Bitcoin and hold for long-term? Who know, advice me please.

We are building a decentralized network for high performance and distributed computing. DO you want to join us?
Best

come up with Coinbase. It is the most convenient and safest place to buy BTC