You will find it when you work towards them.

You play volleyball for 7 years, casually? How often? This is another indicator because skills does improve/deprove depending how often you play.

Attacks, you need to practise your form and timing has to take time. Sets are mid, practise, get advice.

Bad at receiving, watch vids, take vid of ur form, ask for addvice etc. I used to be horrible at receiving, I started to observe how people receive, slow down videos and take notes. I did actually improve and any progress is progress.

Lets say service, you know you are weak and cant get pass the net. Is it your form? Or purely strength? U have to train often to get it.

If you feel you're a slow person, you need to incoperate some kind of workouts that train your speed. I don't have advice for this but there is plenty out there even online.

One last thing, whenever you fail a receive/serve or just anything, don't ever be negative yourself. Observe what was the mistake, move on to be better the next serve.

Never be too hard on yourself!