I think its different for everyone,,
these are some things I have done that were positive,,
I put a peace of tape at the intended draw,, draw to the tape then shoot
practice alot at close range,, 5 yards,,
stop shooting competition if that is effecting your shooting in a negative way,,
just practice practice practice shooting the form you want to develope,,
I shot for many years with 25 inch draw no anchor,, not tournaments but hunting, that is how I felt comfortable,,
the last couple of years I have competed with my friends so I went to a more conventional longer draw for that,,
but it took me several months to be able to do it,,
I think if anything the close range shooting helped the most, I found if form was good,, extending the range was easy,,