How do understanding the body in training in terms of plateaus, do you go through them? What does your plateau look like to you and are you aware of others? how do you get through them instead of bowing into feeling like you’re not making progress?
Plateau wise, that can be specific movements - so smaller muscle groups plateau more often imo than the larger, compound movements
Then I tend to experience plateaus differently in free weights versus machines because as it depends how accurate the comparison in form is
When I do a deload (no training for 3-4 days) or devolume (training at 60-70% of the weight) but still go to the gym (where going to the gym is mentally important / preferred)
If there’s a plateau, depending on the movement, taking bicep curls and the weight options are 2.5kg, which can be a big relative jump, I’d look at working in a different rep range providing the risk of injury is low and form is decent - so if you’re used to working in 10-12, then doing some 6-8 work can help
Also, looking at where the difficult part of the lift is and making that stronger with partials e.g. bicep curls, the stretched position
Could also be done with deadlifts, leg extensions, hamstring curls, leg presses, squats
Or trying to progress it in a compound movement instead.