I added a /bunch/ of repos at some point. xD Here - copy them to your clipboard, then tap "Add New", it should be autofilled. Those are all the ones I use, no idea which one has this o.o...

https://apt.izzysoft.de/fdroid/repo?fingerprint=3BF0D6ABFEAE2F401707B6D966BE743BF0EEE49C2561B9BA39073711F628937A

https://repo.mobilsicher.de/fdroid/repo/?fingerprint=D8EE660B3812AA2DF68D8A9740C02B8C5315C3BB0911E3C223A527A3C7A97495

https://fdroid.fluffychat.im/?fingerprint=8E2637AEF6697CC6DD486AF044A6EE45B1A742AE3EF56566E748CDE8BC65C1FB

https://ltt.rs/fdroid/repo?fingerprint=9C2E57C85C279E5E1A427F6E87927FC1E2278F62D61D7FCEFDE9346E568CCF86

https://nanolx.org/fdroid/repo?fingerprint=862ED9F13A3981432BF86FE93D14596B381D75BE83A1D616E2D44A12654AD015

https://f-droid.i2p.io/repo?fingerprint=68E76561AAF3F53DD53BA7C03D795213D0CA1772C3FAC0159B50A5AA85C45DC6

https://calyxos.gitlab.io/calyx-fdroid-repo/fdroid/repo?fingerprint=C44D58B4547DE5096138CB0B34A1CC99DAB3B4274412ED753FCCBFC11DC1B7B6

https://guardianproject-wind.s3.amazonaws.com/fdroid/repo?fingerprint=182CF464D219D340DA443C62155198E399FEC1BC4379309B775DD9FC97ED97E1

https://fdroid.libretro.com/repo?fingerprint=3F05B24D497515F31FEAB421297C79B19552C5C81186B3750B7C131EF41D733D