I hear & see a bunch of my friends who have an only child struggling with this. My sister has four kids now (which is crazy). She says that in many ways it’s easier with more kids, because they play with each other. She barely ever plays with them at all (which is a bit sad). But because they have each other, she gets to spend all her time being the adult in the room. It seems to be working out - her kids are doing great.
She said it also really helps that they’re a bit older now. A 2 and a 4 year old have a much bigger age gap than a 6 and 8 year old.
All that said, she still doesn’t get much time pursuing her hobbies. She says it’s the after school activities that do her in now.