If you're willing to branch out into stuff that falls into the "not going to get you hired, but enriching personal experiences" bucket, then my number one recom

If you're willing to branch out into stuff that falls into the "not going to get you hired, but enriching personal experiences" bucket, then my number one recommendation will always be 'A Course in Modern Mathematical Physics' by Peter Szekeres. The book compresses so much into ~1000 pages without feeling like you're missing anything as you go. You can get a lot from the David Tong lectures if you want something similar but free, but to me, Szekeres wins out on delivery.