I love the game but can't get myself to play

Hey guys, lately I've been having this problem. I love factorio. It's my favourite game and I've done a bunch of stuff like megabasing and stuff. But now after 1k hours, I've started playing seablock and I can't get myself to play longer than 30 minutes before I just either start watching youtube or walking around what I've built which isn't even a 1 minute walk from one side to the other. I'm not actually hating the modpack or the game. I'm not even getting bored or anything. I just kind of stop. Do you guys have any tips on how I can switch things up a bit so I can get back my usual sessions where I lose track of time? I used to be able to play for like 8 hours straight back when I was megabasing in 1.1. (I took a long break since 2.0 released and finished it)