The fix depends on the cause. Did you burn out due to an oppressive/insatiable boss, or due to pressure you placed on yourself? The first is largely correctable

The fix depends on the cause. Did you burn out due to an oppressive/insatiable boss, or due to pressure you placed on yourself? The first is largely correctable by a better working environment. The second, unfortunately, requires deep introspection to figure out and address the true source.