Things I recommend for submitting talk idea:

0️⃣You should tell people that you are "interested in speaking about [fill in your interest] " this can be friends, coworkers, person who sit next to at meetup etc. Can not stress how many opportunity came up because I stated interest 1️⃣(w/ people who are in your field, like JavaScript or WebDev) bounce ideas like... "I was thinking of doing X"

Those conversation usually yield to "would be cool if you can~" or "I wanted to know~" now you have more things to address in proposal other than "I really like X"