bitcoin slowly went down this year, from almost 20k USD last December and went down at a significant price
what might be the reason why bitcoin's price is going down?
what are the major things that can greatly influence bitcoin?
answers would be fully appreciated

1) Skills investors taking profits
2) Change in market sentiment
3) Regulatory uncertainty
4) Countries banning exchanges
5) Speculators buying at the top without really understanding the technology
6) Transaction speeds
7) Transaction prices

The worlds economy
there are probably more.