You know that these are highly difficult questions which no one here is really qualified to answer definitively except yourself?
That being said, it's all about opportunity costs: Are you better off when leaving the company and trying to focus on your own project(s)?
And what do you expect from starting your own company, more money or more fulfillment? If the latter is the case, your opportunity costs are certainly higher if you'd stay in your current company.
But if you expect to live a full life without any financial or even personal sacrifices, then you should certainly stay within a company. But obviously in your current position you don't get what you've been promised - a remote work. A big no-no, so maybe searching for a - really - remote or part time job in another company, and starting from there with your projects in your spare time?
Because, considering the problems your company faces, it doesn't sound like a part-time job in your current company would be accepted by your employer: He'd probably search for an alternative and you'd loose your job! I'd suggest to stay in your current position, and do your current job as good as possible in the crisis during the next few months, while already starting to look for an opportunity with better conditions elsewhere...at least if you are really convinced that your own project(s)/business is gonna work. (If you're gonna be successful with your own project(s), your current employer will even more understand it, because entrepreneurs have a lot of respect for other entrepreneurs...so in the end it only depends on how the market reacts to your business, meaning if you're gonna win or loose ;)