You don't need to do it all at once, and you don't need to do it perfectly. I follow a lady on Instagram, Henley Fitness she's very sweary but down to earth in her advice. Her mantra is "imperfect action". Can't manage 6000 steps, do 4000.
Can't get to the gym 3 times a week? Go once.
Whatever action you CAN manage, do that. It's far easier to incorporate small changes into your life, and build from there than to jump in with both feet try to do everything. Inevitably fail because, well, life. And beat yourself up, feel rubbish, and be back to square one.
So, starting small.
Steps - how much do you do each week? Increase that by 10%.
Cardio - ignore it for now - steps is fine
Strength - start with once a week. Two upper body push movements eg tricep dip, chest press. Two upper body pull movements eg lat pulldown, row. Two legs eg leg press, step up. One ab - plank or reverse crunch.
Food - start with breakfast. Plan 3 or 4 options with 20-30g protein, so you aren't eating exactly the same thing every day.
When that's familiar and not taking thought, do the same for lunches. But 5 or 6 meals.
Finally dinners - as many options as you can! Meals you can make and freeze so you have grab and go options for when you're tired. Include a couple of real favourites because it's ok to go over your calories now and again but don't hit the FUCK IT button and use it as a reason to eat all the crap.
Protein fills you up - over time, you'll find you're just not as hungry. I can 2000 calories worth of carb heavy foods and still be peckish, but 1500 with 100+g of protein and I'm done.
Once you start to see and feel the changes, that becomes the motivation. And I'm a sucker for a gold star, so use Hevy as my training app and love to get the little rosette for a PB, even if it's just one rep more than last week!
Take body measurements and photos before you start. Yes it's naff, but a couple of months in, when you repeat the photos and can see the changes you didn't realise were there, you'll want to keep going.
If you can afford it, buy a walking pad. Set it up in front of the TV and walk whilst watching a programme - then it doesn't feel like a chore.
Hope some of that helps. I started in the gym last September and thought I'd hate every minute, but the focus on lifting rather than cardio was a lot more interesting - and those initial strength gains are fast! Plus your leg muscles are big - a squat or leg press will get your heart pumping without the need to do a spin class.