Looking for ideas, please. I am a seasoned IT professional with >20 years in the field.

Looking for ideas, please. I am a seasoned IT professional with >20 years in the field. My last position ended in a RIF (reduction in force) after 2 years, and after 4 months of looking, I managed to find another job, which is great, but I'm finding myself in the same situation as I was in at the last one: no communication, no direction, and no one seems to know I'm even on the team (we are all remote). I have reached out to my boss on numerous occasions telling him I can take on more work, that I am not busy, etc., but I get no response. I literally have 2 or 3 hours of work a WEEK. Not only is this frustrating and ridiculous, I can't understand why they hired me at all... what do I do? I could look for something else but I think it's too soon after being hired (it's only been a few months). I don't really want to raise my concerns up the food chain because I don't want to make my boss mad (yet). I'm wondering why in the world this is happening and what are some things I could do about it. Thanks for any thoughts / advice.