Memorizing Pi

I'm trying -just to be able to brag on my friends, tbh- to memorize 314 digits of pi, and I'm already at the 254th digit, but I'm getting into trouble because I can't find sources on how to memorize those last digits I want; I've learned the first 200 with the "Pi song"/"Pi song 2.0" from ASAPScience, and the other 54 with a song I made, but I just can't make a song for the other digits, at least none that lets me memorize them without difficulty (I mean with that that I'm constantly getting wrong strings of 4/5 numbers and switching them with other strings); the first 254 went smoothly, but now I am stuck - for now over a week, and considering I've been able to memorize the other digits in 5 days, I am posting here hoping for help.