Feel like I lost a lot of my time at my current company

Sorry if this seems like a rant. Trying to collect my own thoughts.
I have been at my current company as a mid level backend engineer (a startup - around 10-12 years old, went public recently) for around 4-5 years and have a total of 6 years of work experience.

I feel like there has not been much career growth. Got my first promotion after an year of joining the company and not much thereafter. Thus, feeling very lost about where to go next from here.

In the current climate, we had our recent round of layoffs in the organisation. Also, I don't feel very good about some of the things in the organisation such as the stuff I am working on. I don't feel I am learning enough. It is just business requirement - one after another, that too often getting cancelled. Last project I worked on for 3 months, got cancelled after that due to changing priorities. Stock price is plummeting as well. I feel like the best way forward is to restart my own learning journey - what are your thoughts? I used to be one of the top performers in my current and past company and even got awards around 3 times in last 6 years. I tried to work hard for promotions as well, but even after multiple rounds of my manager asking me to do things such as leading the team, multiple XFN projects, infra level revamps etc. - I did not get a promotion. I asked my manager if there is a list of things I should do consistently for a good enough time and if then, we'll be able to make a case for me. He said, that I am trying to gamify the system, but I was only trying to set goals for me. Now, I feel somewhere midway, I have lost my motivation. Feeling a little depressed and often evade work, just coasting to get by.

I want to take charge of my life again and be positive. Quite often I think about other career choices, but have always been in love with CS (and math in my childhood, particularly due to them being intellectually challenging). Just want to make up for the time I lost, and want to do some things I am proud of. I often think of my life being pointless in last couple of years. And want to get a renewed sense of motivation and be excited for the things I work on.

I feel like joining a fast paced place or somewhere I can learn a lot (even outside of work) might help. Don't feel very happy about my current situation though.