The trouble with making deals is that if you don’t get your desired result, you may feel Hashem isn’t listening and has let you down. So many people make bargains with Hashem and then go OTD because they did not get what they want. It happened before, during the Holocaust.
Better to subjugate your will to Hashem’s, and daven that Hashem finds zechus in you that makes you worthy. That still will not guarantee the result you want, because Hashem only does eshast isd good for us, something which we do not necessarily know ourselves.