You like the work/life balance at Juniper, so stay there or find a place that's healthier that pays well and offers good WLB like Microsoft, Cisco, Google (don't know enough about Arista...FB also is hit/miss on WLB). Stay away from unicorn startups (i.e. Uber, Lyft, Airbnb, etc) if WLB is an issue for you. And yes, Amazon "can" be a sweatshop (or not) depending on the team, but they pay very well and looks good on a resume as a 1 yr. stepping stone (an they're hiring by the truckload right now).
Of course, there's TONS of other great companies that offer a good WLB and that's up to you to look into by Google search.
The ONE theme that you WILL encounter when applying is your tech skills/interview skills. You ABSOLUTELY WILL NEEED to STUDY! It will take you MANY,MANY, MANY MONTHS to get into "championship form" to crack these interviews. The power is in you (you ain't a chump, you got into Juniper after all), but you have to treat it like part-time University (i.e. no weekends/evenings off). Getting an interview isn't the hard part! By far the hard part WILL be PASSING the tech portions of these interviews. You will get your pants pulled down in an embarrassing manner if you don't study hard. The questions, even for a brilliant person who's in the game, will be challenging! No joke! Over 60%+ of on-sites fail.
So is the prep work WHILE working at Juniper worth it to you? To many, it's not. Admittedly, it's TRULY a slog (it was for me)!! Many will wait for the multi-month layoff severance and THEN start prepping. Usually, it's the younger, ambitious, no family yet people who'll do the prep while working. It's really up to you to decide. As long as you have savings and can ride it out 6+ months with severance comp you should be able to adequately land a great gig with full 100% days of prep time to study for interviews.
If you're the lazy, comfortable type. Then you already answered your question. Otherwise, it's 6 good months of Leetcode to get those veins to show up on your arms! Good luck whichever way you go bruh.