I dunno. Just work less overtime, and save it?
Some people are "satisficers" where they make enough to satisfy a goal and then quit. I read about a study of cab drivers--doesn't matter if the study is true for our purposes. When it was busy, the cab drivers all quickly reached their goal of $100 and then quit early. When it was slow, they stayed late and reached the goal of $100 and worked more hours. The economically efficient thing to do would have been for the cabbies to work longer when it was busy, make more than $100 and then when it was slow, cut it off early and make less than $100.
If you were going to follow the same pattern, you could try to bank $10k in OT for the year. Once you reach that number, you stop doing OT for the rest of the year.
I would definitely get off the do as much OT now as you possibly can train. But I would totally consider doing more OT in relationship to a goal (extra $10K/year or fancy vacation or kids expense or whatever...)