There is foreskin restoration. Men who are circumcised use stretching methods to grow skin. The same methods could maybe apply to extending the length of uncut foreskin.
This site should have information on some stretching methods: [Login to see the link]
There are also some subreddits, like r/foreskin_restoration with some information on this topic too.
I have tried some stretching methods to lengthen my foreskin too, although I haven't seen any results. I stretched for about 5 months with no results, although I have read some stories of men who've had to stretch for years (some taking even decades) to restore their foreskin. I might consider trying again in the future, maybe committing to a longer length of time.
A common issue that also arises with stretching is soreness. I've heard that creams and such could be useful for this problem, allowing you to stretch more while avoiding soreness. Two things I commonly hear men use is aloe vera (actual plant gel as opposed to processed gel in a tube is preferred) and lotions (particularly ones containing certain vitamins and collagen). I might consider trying applying some creams myself. Maybe I might actually see some results for once.
