You can continue playing without editing though it takes a bit of extra work every time you die.
When you die, choose to spectate the world, then open the game to LAN in the options, choosing to allow cheats, then you can switch to survival mode in the normal way (you can also set the difficulty to easy or normal though I haven't tested if that works) then you can close down the game to close the LAN mode and continue playing until the next time you die when you have to repeat the process.
Is there any way that i could turn my 1.14.4 Hardcore world into normal Survival?
According to the Wiki you can use a program like NBTExplorer to edit the level.dat file.
https://minecraft.gamepedia.com/Hardcore
You can continue playing without editing though it takes a bit of extra work every time you die.
When you die, choose to spectate the world, then open the game to LAN in the options, choosing to allow cheats, then you can switch to survival mode in the normal way (you can also set the difficulty to easy or normal though I haven't tested if that works) then you can close down the game to close the LAN mode and continue playing until the next time you die when you have to repeat the process.
Just testing.