movicol/lactulose, dulcoease (not dulcolax - too viscious) or whatever works for you to get things moving.
Drink plenty of water, in addition to normal drink times. Keep a glassful by you until you can work out how much you need
A cup of coffee in the morning will help (caffeine stimulates smooth muscle)
kiwi fruit - 2 a day will shift anything, 1 a day keeps things running nicely.
Go to the loo when you have an urge - do not hang on.
Have peace, quiet, and privacy (hard, I know, but it helps)
Sit with feet on a box to straighten out rectum (you need to try this for a few weeks for positive effect)
Read up about Pelvic Floor Dysfunction and learn Pelvic Floor Relaxation when going. Also, do pelvic floor exercises regularly to make sure they are supporting when they need to.
Study the Bristol Stool Scale and try and aim for a type 4/5 - (they are better at self-movement! and softer.)
Eat plenty soluble fibre (oats, fruit, veg) and drink plenty to keep it hydrated. Lots of bran-like fibre on a slow bowel will dry out and make things worse. Crushed linseed on breakfast.
Take a daily walk (or other exercise)
If you are taking progesterone, that relaxes smooth muscle so you will need to take extra care. Also, codeine.
Try eating a load of sweetcorn and see how long it takes to come through. If it takes 2 or three days, you need to work on it (called Transit Time).