Honestly its hard to find any stable and steady income here online if you have a upwork account maybe it can be good to have an steady income.. depends what job you are taking in upwork.
It is not up to the upwork or to that site you are in. it is up to the skills, experience and knowledge you have. if you don't have any knowledge and skills or only have small and useless skills then you can not make good income or only can make a small amount every month. but if you have good skills then you can make money every where. in this site, in upwork and in any freelance and Service related site.