I'd like to know what all was checked at the shop. Is the bow all set to specs? If not this could be one explanation. For example, if the rigging (string/cable) has stretched then the bow might not fit you as well as it did and this could affect your form.

You are having problems enough that I would suggest measuring everything you can think of then attempt to set the bow up to specs and do a complete retune job. You probably didn't measure anything from last year so have no baseline to follow to know what, if anything changed.

One clue I see is that it appears your broadhead tipped arrows are just scattering. This is often a sign of underspined arrows. You say they are leaving the bow straight, but is that shooting through paper? If so then I'll tell you that paper tuning is a good indication of how the arrow is leaving the bow, but not so good at telling you what's going on down range, which you are finding to be quite obvious.

Here again, it could simply be just your form. Having not shot for such a long time the old muscles that do the work may have lost their memory and it's going to take time to retrain them.

Maybe if you could find a good coach he could evaluate your form and go over your bow to see what he thinks is the answer. Hands on experience is going to be better than us guessing without actually checking the bow and/or seeing you shoot.