I usually worked for companies building stuff I myself used in some way, or was interested in using their stuff. Companies that organize community events tends to be easier to approach too, if you do it in person at small non-busy events, even better.
Basically, if you see some product/company you'd like to work with, figure out what you could help them with, write them an email and point out exactly what you think could be better, and why you're perfect for them. Worst that can happen is that you spent some hours writing it and they say "No" :)
But i can start with the companies i know and use i guess
In case helpful, I collected some startups I find interesting, see the startup lists section: https://chrisbarber.co/start-here/.
Though I think the ideal would be:
* What are the products you find most enjoyable to use?
* Of those, which ones do you have ideas for improvement based on your usage?
* Who are the best people you've ever worked with or collaborated with?
* Where do they work today?
Hackathons in areas you have an interest are great for connections as well.
If you want to succeed in life, you must be pro-active, not re-active. Instead of browsing job offers, look for companies that interest you and simply contact them directly. Let them know who you are and what you can do and find out whether they might have a job available for you with your skill and experience. Keep it brief, no need to send a whole CV, but have some online version of it that you can share as a link.
PS: but ignore large corporations. Go for small and medium sized businesses. Those are the best to work for, despite lower salaries, and easier to get hired by. Often you can get in touch directly with the CEO or founder without must trouble. And best way to approach it is to seek companies that specifically interest you for one reason or another. People respond way more positively to such contact than just sending a random email.
"Thanks but no thanks. We're not currently hiring."
Instead you have to look for cool companies and rebrand yourself to fit their needs. Until you do this it will continue to suck and you will continue to be a commodity without value.