How can I get him to put more effort into the relationship?

Tell him you need it. That simple. But sit him down and tell him let him know your serious no laughing, no joking tell him you need him to become more involved and what you want, and mean by more involved, and watch him take to you, and do those things for you it's amazing. Communication. A MUST!

Have a chat with him, say that you think you guys should do more things

Maybe you could try letting him know when you would like to spend time with him. Remember that men are not mind-readers. They do not automatically know what you want or need and when you want it or need it unless you tell them or unless they ask you. You need to pick up the phone and say, "Let's go out and do something," or "Do you want to come over? " etc. Men don't always like to make the first move, and they may sometimes play hard to get, just like women. So, if you want to be with him, you are going to have to take some initiative sometimes too. Also, remember that sometimes people need their space, and if you are too needy, people will be turned off. If that's the case, learn to enjoy being on your own or spending time with other friends as well. But, if the guy needs space, make sure you aren't being clingy because it will turn him off! Hope this helps in some way!