I'm searching for some fics where Harry physically travels back in time, and by physically I mean no transporting memories into his younger body. I want the older Harry to go back, let the younger Harry go on with his life, and either fuck up the timeline or do timeline-changing stuff. Most of the fics I found are all either younger-body time travel fics, or abandoned after only a few chapters.

 

There are lots of those, but here is one that is currently active:
https://www.fanfiction.net/s/13565581/1/Righting-Past-Wrongs

 

There's The Unforgiving Minute by Voice of the Nephilim:
https://m.fanfiction.net/s/6256154/1/The-Unforgiving-Minute