@vionott To Hate a Weasley is hands down the best Fred Weasley fanfic I've read (and I've read plentyyy). I don't typically enjoy enemies-to-lovers stories because they're incredibly difficult to pull off well, but you did it beautifully.
What I loved most was that the relationship never felt rushed. Watching them slowly grow on each other felt natural, warm, and genuine. It didn't feel like they hated each other one day and were suddenly in love the next. Every step of their relationship felt earned, which made me so much more invested in them.
I personally wished it had been longer because I wasn't ready for it to end. I would have loved to see the story developed even further. The ending definitely caught me off guard, but it's your story, and I appreciated that you gave readers a little more afterward.