Ah OP I feel you, when my circumstances changed and I became a young widow and we have a dog.
I really didn't know what to do for the best because I work all day, and even when I'm WFH I can't leave my desk really or the phone is always going and needs answering.
I decided against a rescue/re home because I realised he wasn't a puppy he's also a XL breed so he'd probably spend the rest of his life in a kennel and it broke my heart.
Anyways, I wake up at 6:30am, I walk him for 40minutes and DS, Come home feed him , feed DS breakfast, then we go to school/work and he just snoozes all day with the radio on he also has the cat for company.
Then when I get home it's another 40minute walk and lots and lots of fussing and love all evening.
No it's not the perfect life for a dog, but I genuinely think he's happier with us, and snuggled up on the warm carpet floor next to our beds all night than in a kennel.