Solo primitive camping

I want to get more into primitive camping and I’ve done it before for only 1 night at a time and with another person or two. I want to go on a 3-4 day trip by myself but I’m a little bit anxious about it. I’m looking for any tips/suggestions that could help me. Also, I want to stay entertained and busy during the day time, I’m bringing a book, a fishing pole, and will probably try and build a fort to pass the time but would love to hear some other suggestions.