i have not played totk, but i have done the final fight of botw. botw is one of those games which is designeed to not have any post game, i guess you already know this, but if you do the final fight and defeat ganon, you see some cutscenes, you see credits, and then game is over, you do not get to be in a world where you have defeated ganon. if you continue, you resume from last save before ganon fight. it is the director’s prefered way (with which i do not completely agree, but sure, i respect it), so i do not think it necessarily ends the fun. (i actually had to defeat him thrice because of some glitches, i could not complete the scripted part of end fight twice). once you resume, you can “complete” the run, like complete all missions, all shrines ( i had only done some 30-40 before fight i guess), explore in general, buy a house, and you can keep on doing the final fight n number of times with different difficulties, like no healing, no weapons, etc.