Hey! I hope you get into UofA, fingers crossed! ❤️
In terms of what you can do until next application season (if you have to apply again), here's what I did. I got into mcgill this round, and it's my first time applying, but I've known I wanted to do SLP for a while now. In this year before applying, I took linguistics courses as an independent undergrad student because 1. I wanted to learn more and 2. it boosted my GPA. I also volunteered in 2 SLP settings (private clinic with kids, and community centre with adults). It sounds like you've got the SLP exposure already with your job which is amazing. Perhaps taking extra classes would help with GPA.
In terms of rejection, I totally get how you're feeling. When I finished my BA in psych I applied for 2 masters programs in psych and got rejected, it totally sucked. What made me feel better was seeking out opportunities to get more experience and add to my CV to make it better (and I ended up changing career paths because of this). I took 2 years off between my BA and this masters in SLP, and people told me that being out of school will make you not want to go back, but I never felt that way. I never lost momentum because I was always seeking out opportunities that would eventually help me go back to school. But, many times throughout this 2 years I felt lost and aimless like you said. What helped me is thinking about what I would say to a friend in my situation. I am also very hard on myself and this helps me with that.
Best of luck with everything and my messages are open if ever. You got this!!