Low sperm count

This is my first time on here, still have alot to learn about TTC lol we just found out that my husband's sperm count was very low! 4 million. We have been trying for over a year, he is 37, I am 27. My husband most of his life took hot baths daily. I finally told him no more baths lol so just this last week he started taking showers. Do you think that could be the problem and maybe his count will go up now that he has stopped the baths? He is also a smoker. Unfortunately we both are. I have tried cutting back quite a bit but idk if he has. They want him to give another sample and blood test. Won't see the Dr again until December 😔 wondering if anyone knows what the next steps will be. Thank you 😊