If you only have callouts and no mods (like vehicles, sirens, visual add-ons, AI behavior, etc.) there's no reason to keep a MODS folder in your main GTA folder. The last option is to start over. Uninstall LSPDFR, verify the integrity of the GTA files, reinstall LSPDFR and carefully install the callouts one by one.
One tip for you. I prefer to download mods that have been updated at least after 2022, because they support the latest version RPH 0.4.9. Sometimes you will find that they support 0.4.8, but I don't download those anymore to avoid any issues.