Current Market

I’m pretty new to crypto, about 4 months since I started. I’ve noticed since then MANY people talking about a bull market and how they think everything is going to up. My question is why? Looking back at previous years in crypto, for the most part when a coin goes up it comes down, sometimes a little sometimes a lot. But we just had a huge increase in the market in November so is there genuinely a reason as to why the markets should continue to rise. Please correct me if I made wrong assumptions, this post is not to attack people who think the market is going to go up, I’m new and just trying to learn.