Well, firstly, I'd say, make ot https for fun. It's pretty simple to do, makes itself automatic, and costs no money. Just exploring this route can be very illuminating.
Secondly it prevents your site from being altered by the outside. There's a lot of equipment between your site and the client. Being HTTP allows it to be altered along the way.
Gor example, and thd least serious, is that your ISP can inject adverts onto your page. Most ISPs don't do this, but quite a few do.
Second, a malicious user could inject additional text onto upur pages, proclaiming your love for a political party, some racial or misogynistic slur, or whatever.
Third, you're sending a signal to all that you either don't understand the security risks, or don't care about them. This can have consequences (reputationally) if you are in, or going into, a computing career.
Making it HTTPS can be fun too!