Yeah I had a list back in 5th that was similar: Very sit back with a gunline and shoot. It was good but became boring and not very enjoyable.
Luckily I have found with Guard you can mix it up a bit and they are more flexible than people think. I started adding things like outflanking scout sentinels, deep striking storm troopers and a couple of chimera vets to go along with one blob, plus a vendetta, some artillery and a tank or two: Hitting them from the land, sea and air is MUCH more fun than sticking to just chimera vets, or just blobs, or just MSUs in my opinion.
Try mixing it up: You can make really decent assaulty blobs with the new codex, especially if allying in Inquisition and throwing in characters like Straken.
x2 30-man blobs with flamers, maybe some power axes, a priest and a primaris psyker or inquisitor can make quite a mean assault unit that can also lay down some hurt with all those twin linked lasgun shots. This gives you much more variation rather than sit back and shoot with a gunline, and as such I find it really fun. Or you could look into the new Tempestus units, have fun deep striking with an elite force. Or Orgyns/Bullhgryns mixed with Straken or Yarrick. Just experiment. Guard have a lot of variation when you dig deeper into them.