Look at the things you want or need to do day-to-day, and create contexts around those where social fabric can form
Instead of working from home, work from the same coffee shop a couple times a week. Make small talk with the people behind the counter and the other regulars, learn names
Have remote coworkers who live in the same city as you? Suggest a regular trivia night at a bar. Or host a weekly D&D or board-games night at your apartment
Create parties, cook people dinner, suggest day-trips to do fun things
Reach out, organize, offer to host, make small talk with new people even if it's not especially interesting right off the bat. But get curious, ask about the details, pull on threads, and you'll get past the boilerplate pretty fast
If you're literally starting from zero it can be hard - maybe you just have to seek out meetups or whatever as a starting point - but you have the ability to create change. A social fabric is a thing you cultivate, not something that just happens to you like the weather. Took me many years to learn that, but it's true
I don't mean to make it sound easy- for some of us, keeping a healthy social life is as hard as keeping a healthy diet or exercise routine is for others. But you do have agency over it