Have there been any compelling theories and or bits of evidence to suggest the origins at least geographically of the bronze age sea people?

We've actually got a fairly good idea about some of the so-called 'Sea Peoples' (the plural is necessary - they're not just one group, as you'll see). More can always be said on the matter, so if anyone would like to contribute further about this particular facet of the Late Bronze Age, please don't let this post stop you! In the meantime, OP, you may be interested in these previous threads:

u/kookingpot has a look at the Philistines, one of the Sea Peoples;
u/Bentresh here has a roundup of their previous posts on the Sea Peoples.