please suggest me some best altcoins that can easily give 2x profit if I hold them 1-year.
You can find a project like this among the top coins. Even BTC itself can do that till halving. ETH and LTC can also be added to this list. They have also lost much value in this last bear market, and there will be no better chance to recover for them. However, do your research and make the final decision yourself. Keep in mind that if the price of the BTC increases, the top altcoins will increase as well, but you should find out for yourself wich one how much will increase.