In terms of making more $ the first thing I would work on is salary negotiation, not necessarily skills. There are a few great salary courses on udemy that can help with asking/answer the right questions when looking for something new or even a raise.
In terms of location/salary - I would also recommend looking to freelance for companies in NY/SF as you can get a higher rate rather than central US.
Lastly - I would say to not just think in terms of $100k but in terms of products. What products/site could you build that charges $30/month (SAAS) and can get 500 signups. Just that would get $18k/month in revenue or over $200k/year. Now $30/month may sound like a lot but take a look at Basecamp (http://basecamp.com/pricing) $20 minium a month or dive into b2b saas and checkout some of the crazy #'s they charge - http://www.marketo.com/small-medium-business/pricing.php
500 clients sounds like a lot at $30 - but no matter how you do the math (10 clients $1000/each) or (100 clients $100) a product can easily pay over your $100k/year especially if you spend the next 4 years building it. Focus on getting your first paying customer within 1 month of today and just keep going hard.
My 2 cents :) Good Luck!