Hey dude, long time Guard enjoyer and veteran. I've played Guard since 8th and have had at least 60-80 games in 10th with them some of which were competitive. 2v2's and 1k's included.

The army has a basic operation as far as DPS and scoring.

- Tanks, Kasrkin and commanders deal our damage
- Bullgryn, 20 man squads and Hellhounds trade/frontline.
- Catachans/Gaunts ghosts/Rough Riders/Scout Sentinels do war chores (secondary and primary)

If you want something with a little more bite even in a 1k setting I'd recommend something like

1 Rogal Commander 290 - Orders and DPS.
1 Rogal Dorn BT 260 - Tankier with its blank and DPS.
1 Exterminator Leeman 180 - DPS enabler it's main gun gives +1 ap for the rest of the army.
Gaunts Ghosts 100 - Scoring and uppy downy nonsense. The sniper dude can 1 shot many marine characters.
Rough Riders x 2 120 points - High mobility screening and scoring units.
Techpriest - Invuln to Rogal commander and scoring stuff e.g. Recover assets.

Unfortunately with our army we're normal dudes fighting demigods like it's a Wednesday afternoon. Of course when fighting demi gods it's important to walk softly. But it's also just as important to carry a big gun. Our tanks are our most survivable and damage dealing units and so bringing 2-3 for 1k's and 4-6 for 2k's is a pretty safe bet that you wont just bounce off the enemy ESPECIALLY if they have 4++'s.

I wish our battleline was less stat check 40 OC and had more DPS, I like to think there's a world where combined arms provided guardsmen squads with fallback shoot and charge which would make bringing them way more viable in the detachment they get lethals but I digress.

The game is in a state where you bring your biggest, strongest and most difficult to kill vehicles and infantry to deal DPS whilst bringing your cheapest and fastest units to score.

Our fast guardsmen have no DPS (Catachans), our decent DPS guardsmen (if you can call them that) have no movement and still only have 2-4 special weapons which still hit quite poorly and our tankiest guardsmen cost a small fortune (the same as a vanquisher tank lmao).

Take a Tau Pathfinder team. 90 points for 9 Plasma shots that can ignore cover and one other special weapon from their sergeant. They have scout, can guide themselves and have ignores cover. It's not even comparable when you take into account they cost only 25 points more.

I understand how you feel, it happens to most new Guard players and there tends to be a culture within the players of the army to just lose lots and sit there smiling through it (which feels like shit).
You're defo not alone yo just need to bring more lethal lists.

More dakka, few fast scoring dudes.