One or two children?

How did you decide if you wanted another baby? My LO is 3 now. My SO and I both work full-time. LO is in pre-school. During the pandemic we’re working from home, which is a blessing. But soon we’ll be expected to return to work on-site and in my area traffic is hell with 2-3h commute per day. We don’t have family in the country or even on the continent. How do you manage 2 and still stay sane? I adore my LO and I want to be present and available for him and not too stretched thin. I also eventually want to have some me-time, something that’s just now starting to happen again. I’m turning 40 this year and have to hurry if it’s supposed to happen at all. Any well-meaning advice appreciated. Note: we can afford it financially.