Breaks are insanely important and usually underestimated. I have personal experience of this, not in DOOM but in another game that I've played actively since 2009, osu!
When you spend a huge chunk of your playtime to one singular game, you tend to enjoy all sort of things that the game and the community is offering. The different styles of beatmaps I played, all sort of community tournaments I played and so on. Eventually however I also got hit by that burnout and it does happen from time to time. Playing some types of beatmaps feels insanely bothersome and forcing myself to play them to improve myself feels like work. That's why you need to mentally reset, a snap. Play something else a bit for few days. Even right now as I am writing, I am recovering myself with some Risk of Rain 2 (which is insanely good game, highly recommend) and it is doing some wonders.
DOOM is not going anywhere.