Contrarian opinion here - maybe it's okay to leave the side projects behind. I don't work for a FAANG, but have had several senior and lead developer positions at mid-to-large companies for the last 20 years. As I moved in my career I took on increasingly challenging projects at my day job, and quite frankly there was nothing I could do in my free time that would be close to the challenge or variety of some of the larger projects I have worked on. By the end of the week I just had no brain capacity for more tech stuff.
I have consistently spent 10% of my work time on new training (whether it was company policy or not) to ensure that my skills have kept up to date, and I use that to introduce new technologies to the company when it organically fit the companies needs.
I would suggest experimenting with some new hobbies (preferably something athletic to offset the office work) to see if anything interests you. You may have reached the point in your career where your day job is enough "tech stuff".