Hi Hannah, and old trick we use here is stuffing them to the brim with damp newspaper balls for a night. After the night you tske the paper out, oil the boots, and start wearing them a lot. I gave up on making boots comfortable to wear, I just wear half chaps all the time 😅
Just condition them a lot. Condition the inside too, and wear some tall socks and wear them in your house all day. I think having to throw away a pair of socks is a small price to pay for nice,softer boots.