Concentrate like these guys have said above on your FORM . Consistency , Consistency , Consistency is what you want to work on .
Try to get your anchor exactly the same every time, draw it back there get into your anchor and let down , do not shoot . You can practice this in the living room if need be in these cold temps
Feel that tension in your shoulder blades.
When outside, as Shaun said so well above at the release nothing should move for my shot to go where I'm looking, especially your bow arm it has to remain perfectly still at the release. Do not peek to see the arrow flight, as your shooting improves the flight of the arrow will cross your sight path as a guided missile would. Envision your sight as a laser beam to the spot you are looking at .
Again keep everything consistent so that you are not working on ten things at a time . Remember FORM, FORM ,FORM !
If I could suggest one thing to improve everyone's shooting ,I would say consistent draw and anchor . I'm no expert but been doing this for over 20 years.
Jack