You may have a few sources lined up in which you find writing or proofreading jobs. But it may be time to rethink your sources and expand them. Consider adding new sources that offer jobs with better pay. You will need to think outside of the box when considering options. You can get recommendations from other freelancers. You may also need to consider expanding your skillset to become better qualified for opportunities to you want to apply for. There are sites that will give tips on where to land such jobs, and it may not always be found online but through print publications such as magazines and books aimed at freelancers.
This is a good time to do your homework on who pays what. Meaning, explore different niches to learn where the money is. You may have some experience under your belt, but you can get a better idea of how qualified you are to apply. You may have to acquire more knowledge on the field of interest and this can be done fairly quickly. Just make sure it is something you will enjoy writing about. You can get insight from other freelancers on which niches offer the most lucrative opportunities.
The right mindset will make all the difference in the world. At first it may get complicated finding something suitable to apply for. You may even get discouraged. Keep your mind focused on what you want for yourself. Keep looking into different lead sites and keep networking. Your confidence will help you stay in the game and it may not be long before you get an offer you want.
If you think about the situation from a negative standpoint you will not receive favorable results. The right mindset will help you create a plan that will help you find what you want. Freelance writers need tough skin to be able to deal with rejection. After a while it is no big deal and you can push forward knowing something is out there for you, including well-paying writing jobs.