I don't think that bitcoin will be able to hit $100k in 2021 because it is not near at $100k and it needs more positive sign. It needs time to grow bigger. Bitcoin may hit $100k in the middle of 2022. Actually, it is not possible to predict exact time for that.
We are already on the half price but I agree, it wont happen this year because if we hit $100k then we might see the price to go bottom again because its not a healthy pump, we have to be more patience to see a good price. This is just a prediction anyway, anything can happen so just be prepared and of course expect nothing with the price of Bitcoin, better to monitor the market as it moves and stay beyond $50k.