Longer arrow = shortens point on, shorter arrow = lengthens point on. But you need to tune for that arrow.
Faster arrow will increase point on but squash up some gaps giving a little more leeway on distance estimation. Lots of ways of getting that.
Raise nock height = shortens point on, buts its mostly marginal until you get to extremes and not worth messing with, especially at risk of impairing good arrow flight.
Tiller can be used to affect point on marginally - again not really worth bothering with.
Changing anchor - likely biggest impact. Anchor high up nearer your eye line for a reduced point on. But this will affect form.
Head tilt - similar to anchor (you can do both) - this can affect your point on. If you tilt your head towards the string, say for example so the string contacts your eyebrow, you can reduce your point on. Again this would have ramifications for form. This is a marginal head tilt once at full anchor rather than a stick your neck out manouvre (some oly shooters do that searching for the kisser). It depends where and how you anchor but it is an option for some.
Sight Picture - you can work on perceiving your sight picture somewhat differently to how you currently do. Perhaps change the focus of what determines your point on. Could be arrow point, or shoulder of point, shaft just behind point, top of shaft, bottom of shaft behind point, etc.,
Different Point Ons - you can also make use of a set of different point ons to meet your needs. Could be point on with point of arrow. Point on with shoulder of arrow, point on with shelf, point on with arrow rest, point on using a split finger hold, etc., Even split the difference between say shaft and shelf.
But as you can string walk I wouldnt bother with a lot of that as its more for gapping. Gappers would often try and set their gap towards their average or middleish shot distance or to the 3rd quartile and simply hold over on the longer shots and maybe use the shelf for very long. But for SW I would say set the point on quite long (depending on the type of shooting you do) so for 90% of shots it is point on or crawl down the string.
But dont change too much too soon as your form will suffer. Make one small change at a time and see if it helps.
Good luck.
Dylan