Making your own custom modlist is definitely the most satisfying thing, although I recommend using some kind of vanilla+ mod pack as a baseline just to save time. Last year when I was playing and modding STALKER Anomaly I used the now-defunct HACR, but it lives on spiritually as Null Point. That should be a good moddable baseline. Back then when I was hanging out in the HACR Discord I put together this document of some mods I liked that I added on top of the pack. I haven't played or updated that document since last winter though and there's been some new cool stuff.
Otherwise there are tons of YouTube videos out there that list like, Top 10 X-type mods for STALKER Anomaly, those are a good way to find new stuff. ModDB is full of nice mods, although unfortunately a lot is moving to Discord now. Hang out in the STALKER G.A.M.M.A. Discord server, that's (unfortunately) a place where a lot of new cool shit gets posted. There is an engine mod on there that gives true Picture-In-Picture scopes with negligible performance hit, if you care about that stuff.
Also, make sure you know your way around some kind of text-comparison program like WinMerge or your favourite code editor because you're going to have to merge some scripts and make your own patches if you're building your own custom modlist.