I have already done the Felldew exploit and I can still level up alot more. The only problem is that all of my attributes are maxed out so I cant level up. Is there any other way to lower your attributes.?

I don't know of any mods to do this, but if you don't have anything against using the console, you can type player.setav [attribute or skill name] [new number]
For example, if you want to make your strength to 50, type: player.setav strength 50

Spend a lot of time in jail.
For each day you serve in jail, one skill is chosen at random. If it is Sneak or Security it will increase by one point; any others will decrease by one point.

Jail can be exploited to allow your character to level up past your character's maximum level. Each time a major skill is decreased by serving jail time, you have an opportunity to train that skill again. If your major skills are decreased by ten points, you will be able to gain an additional level. You can keep getting sent to jail as many times as you want and continue to gain additional levels.

jail can only lower your skills not your attributes. oh and Im playing on xbox 360 so I cant use mods or console commands.

For levelling purposes, no. You can get damaged attributes of course, but the levelling system will still see your true attribute values.

Mara