If you like a Thomistic view metaphysics and like Ed Feser, here is one of Feser’s Arguments for the Existence of God *Redacted from The Last Superstition: A Refutation of The New Atheism, page 90.
1 It’s impossible to avoid realism about universals, propositions, and mathematical objects.
2 And the existence of these entities in some form or other cannot be denied.
3 Moreover, one cannot regard those objects either as material things or as dependent on the human mind for their existence.
4 There are also serious problems with understanding them as abstract objects existing in their own right in some third realm.
5 But they could also not exist apart from any mind.
6 For example, a proposition is the kind of thing that exists only as entertained or contemplated by a mind.
7 Furthermore, it’s implausible to say that triangularity, for example, though neither material nor entirely mental, would go completely out of existence if every particular triangular thing and every mind that might think about triangularity went out of existence.
8 For it would still be true in that case that the angles of a triangle add up to 180 degrees.
9 And other geometric truths would remain as true as they ever did.
10 But if universals, propositions, and mathematical objects are eternal and necessarily existing entities that cannot plausibly exist apart from a mind, and such a mind could not be a finite or limited mind like ours, then they must exist in an eternal and infinite mind.
11 But such a mind is exactly what God is supposed to be.
12 Hence, God exists.