What fighting sports do you recomend?

I want to take lessions in my freetime, but i dont know where to start.
I did karate back in the day (8-9 years ago).

Depends on what you wanna do. Do you want to effectively defense yourself in, for example, street fights or do you wanna practice something like Kung Fu or Karate again?

I personally would recommend something like kickboxing or simple boxing

MMA was my favorite but honestly everyone is different.

Kick boxing and Full contact, it's the balance. I think you'll get over fear and gain way more confidence.