Help a girl out please!!

Hey guys so i need some advice please its very embarrassing for me to talk about but i love my fiance to death we have a great relationship and everything but when it comes to sex i dont feel like i satisfy him enough as much as i wanna anyways. We have been together almost 7 years and we have a child together(C section)so things arent the same anymore down there as they use to be and this has brought my self esteem way down keep in mind im only 24. My partner isnt very big either hes just right for me but it doesnt help with my vagina not being tight. I have only had sex with 4 guys in my life before i met him, i had bought a vaginal tightening thing online it worked one good time like really good he was moaning and everything but it broke in half after awhile and i tried twice last night to use it and it did nothing besides give me a bad burn down there so now im sore af. Please help me and give me some advice bc this is really effecting our sex life and i wanna do as much as i can for him as possible. When he feels good it makes me feel good..i have tried keagles and they dont work either. Please help😔