It depends on how much money you have. You could pretty easily pay someone on Intro to spend some time with you, but experts can be crazy expensive. You could also just do a ton of cold email with very specific questions and build your own network of mentors. I'm sure posting stuff like this on various forums could also end with someone volunteering their time.
The more specific you can be with what you want to learn, the better off you'll be though. "AI expert" is still pretty broad.
"Life punishes the vague wish and rewards the specific ask"
I'm also building in the lakehouse space and anecdotally have seen more excitement around Iceberg over delta lake just because of its completely open source origins. Iceberg has evolved faster and has had more contributions from a more diverse set of contributors than Delta Lake. Not sure if this will change with a Snowflake <> Tabular acquisition but I'd easily bet on Iceberg if current trends continue.
The more specific you can be with what you want to learn, the better off you'll be though. "AI expert" is still pretty broad.
"Life punishes the vague wish and rewards the specific ask"