The downward trend did not stop even this year. Crypto trade is characterized by high volatility, which is also related to their small tradable volume. Whether it's a good time to buy bitcoin, no one's gonna tell you.
The price may fall by hundreds of dollars a day and a thousand dollars a week rise. If you think that for more than a year the bitcoin was $ 20k and today is $ 3.8K, so in the long run it's a good time to buy bitcoin cheaper.
And you will become a long-term holder if you will have patience for several years.