Видео когама момо
Another way was focusing on other rewards that dropped - like relics. The final day I got her was when I was going for relics and "just happened" to get her BP. For these I focused on them, only reason I was doing the mission was for these, turn on some tunes, listen to a podcast, whatever, and just have at it.
Luckily enough a friend tagged along and it became his go to frame until Wisp came around. In a grinding game, if you tunnel-vision you will get burnt out very quickly, spread yourself out and find other things to do too. Sometimes the grind will test your patience, other days it will reward your diligence.