What's your timeline here? 100 resume sends over how long a period?
If I can give some unsolicited advice, I would recommend
1. Put your resume on Monster. Hordes of recruiters here will give you a lot of phone calls. 50% will be for bad fit jobs, oh well, sucks for the recruiter, take the call and use it as practice. Maybe they'll get you an interview, boom, interview practice. You might even get an offer this way which you can use as leverage against other positions (or just to add urgency to other applications).
2. Indeed jobs, in my experience, are absolute garbage. I don't waste my time on that site anymore.
3. LinkedIn and Angel.co have the highest quality positions that I could find.
4. Connect to as many people a day on LinkedIn as you are capable of - this will allow you to make more 1st level connections which will then allow you to send more "hey, do you know anything more about this position? I'm looking to apply and want to know what your experience at x company is" type messages.
5. Stack Overflow jobs is a great portal for remote jobs.
6. Those code-test-find-you-job sites I've heard good stories from, can't remember names off the top of my head, sorry.
7. Took me 250 resume sends to get my last job, which led to 30 phone calls which led to 10 code tests / interviews which led to 3 offers. Food for thought.