My DC have unlimited screen time. They also have unlimited access to crafting things, and reading materials, and outside space, and and and...
They do spend time on their screens but they also spend hours creating things - crafting models out of air drying clay most recently; they independently found and watched a tutorial on what they wanted to make on YouTube then they gave it an excellent go themselves.
They also read. A lot. The elder (9) more than the younger (6) but I think that's because 6 wants to read the same things as her sister and it wears her out. She's trying to read the first Harry Potter at the moment and won't have it that it might be better if she left it for a year or so. 9yo has to be told to turn off her light well after bedtime because she's engrossed in her reading, but that's fine as far as I'm concerned!
I can't get worked up about this, these children have just spent the best part of two years in which everything was via a screen, give them a break. 9yo DD did (and still does) a huge amount of socialising via FaceTime/video calls and she's been speaking to her friends almost every day this holiday. That's social capital even if they're not there in person. Give them lots of opportunities to do different things and they'll find the stuff that interests them.
I do model reading for them, I get my
Kindle out and ignore them unless someone is bleeding. It's effective because I get to read my books and they get to see it and also sort out their own arguments which is a good life skill IMO.