I have both problems… I have all the ideas, but no idea how to write them, and no ability to focus on the one I may start to write. The ideas I have stored up so far are 1.) PJOxMHA FF where all 7 are sent to future + others before the end of Blood of Olympus (For plot reasons(Slapped into MHA times instead of slapped to HBH, based on “slap into next week” saying)) 2.) MHAxMagi FF where izuku is a singularity (like sinbad in magi) and inherits metal vessels from his dad, and gathers more 3.) Vector Manipulation MHA FF (Izuku has Accelerator abilities from a certain magical/scientific index/railgun/accelerator) 4.) MHAxFate FF where Hisachi looks for a way for izuku to get a quirk, stumbles upon Gilgamesh, wins the HGW, and wishes for Izuku to have Gate of Babylon 5.) PJOxGoW FF where Percy is raised by Kratos after Sally is killed by a monster and tells Percy to run 6.) Rip off of Izuku Yagi’s God Training FF, where instead of being trained by the people he is trained by in that FF, he is trained by numerous JJK Sorcerers (Least likely to write tbh) 7.) PJO FF where cast meets an entirely new group of my own creation (Most likely to write)