They all have less free time than me and have things going on, but I feel like they could put more of an effort in.

I don't need to be coddled or showered with attention by anybody. All I ask out of my friends is to at least put some time in. Heck, I'm cool if we only talk once every 2-3 days, as long as there is something.

Even back when I was working a busy regular job and had a lot more going on in my personal life than I do now, I still put effort into keeping contact with those whom I value most.