A gem of the year for me: “A Course in Algebra”, by Vinberg
https://bookstore.ams.org/gsm-56
A gentle introduction into Abstract Algebra. It is very well written, with a lot of examples. Recently, I opened for myself Soviet mathematical books, with no-nonsense terse language, without entertaining pictures, but with good examples of applications.
Another math title that someone recommended on HN, I am digging into now: ”Foundations of Applied Mathematics” https://foundations-of-applied-mathematics.github.io/ It is going to be 4 volumes, Volume 1 is available, Volume 2 arrives soon. It is a useful book (soon books) on maths for specialists in AI and computational areas.
Last title, not released yet: “Topology through Inquiry” https://bookstore.ams.org/text-58/ Sure, there is the famous Munkres book as a great intro into Topology, but this one may be interesting to learn maths using inquiry-based learning approach.