I've been getting better at making small but meaningful changes to my life by recognizing that a lot of it is simply habit/routine, making an earnest effort at thinking of ways in which I can modify them, and making an earnest effort at applying them.

Very generally: Think of something I do that I might want to curb, think of why that thing is what I do, think of things I could do that would impede on my ability to do those things, and implement those changes.

Couple specifics:

I'm fond of beer. I don't binge or anything but if it's in the fridge I'm probably gonna grab one every couple of hours, and that's not too healthy and kind of a waste of money, so now, when I buy beer I just toss a couple cans in the fridge and put the rest in the cabinet above the fridge. If I run out I'll toss a couple in the next day. Now I drink a lot less because I'm not gonna drink warm beer and when I open the fridge I see the scarcity and tend to just shut the fridge and walk away.

I'm an introvert and I love reading about things and events, non-fiction crap, walking around on Wikipedia and stuff. It drives my wife up the wall when I'm doing and I don't blame her because I'm bad at listening when I'm not giving my full undivided attention, so I removed all my phone chargers except for the one in the bedroom. Now, I just set my alarms and plug in the phone, walk into the other room, get out of that headspace, and engage my wife in conversation.