Yeah, things like add-ons (vechicles, clothes, weapons etc) - same with replacement - can cause fps drops too if everything is in rly high quality - it's worth to remember
As for your plugins - they seems ok for me, only Variety Callouts caught my attention cuz it seems quite outdated (last update at 2020) so for me it would be first thing to check. Also remember to keep up date rest of your plugins.
If you don't know what callouts pack you should use to avoid problem then here you have some inspiration. Maybe soon I will update my post there too