Should I quit my job and learn new language?

I am working as a PHP developer from the last 2 years. First when i started at my company ( It's non IT Company ) everything was good there were no restriction and a lot to learn as fresher and some good projects as well. But now we hardly have any projects or anything to learn. Plus there is no good marketing team and some bad politics happening right now, workplace isn't good as well. That's why i don't enjoy working there anymore.

So, i want to quit this job and don't want to take any new jobs for 6-9 months. In that time i want to learn full stack with JavaScript as i already know React i think it will be better option.

And yes i belong to a rich family so there is no issue of money, if i don't work for a year or so. Also i can do some freelance projects if i need money or exp.

So what is your thought on this? What will you do if you were in my place?

Update (26-Aug-2020): I made this post in Dec 2018 and I ended up quitting my job in Jan 2019. Then I started learning deeper about ReactJS and NodeJS. And now I am working as a Javascript Developer in a new company from Dec 2019 and I like it. I did some freelance projects during my free time to gain more experience and overall I really enjoyed switching from PHP to JS developer. Thanks for all the guidance :D