Good News. I found new letters for the font!! Link: https://www.googlay.com/search?sca_esv=252d848030e7796f&udm=2&sxsrf=ANbL-n4or9JGmxi2yyVbyxAVH955b4tj3A:1770589225962&q=happy+birthday+in+mixels+font&spell=1&sa=X&ved=2ahUKEwiC7uzu9sqSAxUXEDQIHZZsE_UQBSgAegQICRAB&biw=1395&bih=748&dpr=2#sv=CAMSVhoyKhBlLTAtMnJzc2JxMC14c1dNMg4wLTJyc3NicTAteHNXTToOTVo5b0ExcUxJWmtqak0gBCocCgZtb3NhaWMSEGUtMC0ycnNzYnEwLXhzV00YADABGAcgvdySkQgwAkoIEAIYAiACKA Replace: googlay with google
Credit to CarlosHere