Depends what you're avoiding.
I usually find there's an emotional issue behind whatever I'm avoiding at the time.
One thing that really helped was that I think I've finally found a way to do what I really like to do and make money from it, so I'm trying to do a lot more of it in my free time. I think we all usually have a hobby or passion that we'd rather be doing, and if you can start a small hobby business on the side and grow it that could help in the long run.
If you're already at where you want to be then I have no idea, if you're avoiding it it can't be that crucial in the first place, unless it's something like an assignment where you may be procrastinating for a number of reasons. One of the most interesting things I read about procrastination was that sometimes people get bored by their assignment, so they put it off until they can't anymore, then at least the assignment is less boring because it's more of a challenge, even if you're incredibly stressed out by your tight deadline. I think the easiest way to tackle any assignment is to take it home the first day, work out realistically all the steps you need to take and commit to taking x number of steps every single working day, that way you don't have to do a lot of it but you're still getting it done.
Also sometimes people have higher standards for themselves than what they'd like to have, like maybe they don't really care if the house is messy but are worried about what someone else will think. I personally like things tidy, but I know a lot of people avoid housework, easiest way to get it done is to adopt a system like fly lady or similar. When it becomes a habit where it's done in small steps it is not so hard.
Also I think it's important to remember, humans tend to do what they get rewarded for and will avoid what they are punished for. If you set up your own reward system you may well encourage yourself to change, especially if you take small steps and reward frequently with small rewards. Probably best not to use a food reward unless you choose a healthy food.