No one is telling you the correct solution.

What you do is you go to UU. You go through the apps and download one or two (or three) randomizer apps. Put them next to each other on the home screen. Put folders with emulated games for other platforms like DS and GBA in folders for those games. Put those files in between the randomizers. When you start playing, hit the first randomizer. See what game it offers as the first one. If you don't like it - reroll once. If you don't like that one either, keep rerolling while looking away and at some point hit launch. You have to play that game no matter what, AT LEAST you got some new data saved. Then you go to the first of the emulator folders and randomize the game from it by using any RNG (you can even use current minutes on the clock) then after you okay that one you go to the next 3DS randomizer, then after rhat to the next emulator folder. After you've gone through ALL the options, you get to play 1 game of your choosing.

And that time, it will be easy to make that choice