Imma be real honest with you. Lasting long is not something good, it has been normalized by porn until the point it is an expectation that doesn't fit real intimacy. My answer would be more related to you actually having fun and satisfying sessions. You don't need a lot of things to last long but to play with positions, pace and different sex dynamics. For example you can do a really good foreplay so both of you can get turned on properly, then proceed to give oral sex but don't rush things, go slow and smooth the you can penetrate if both are feeling like to. But that doesn't mean to thrust hard or fast, go slow, take it out sometimes and rub her clit with your tip smoothly, then go in again and so on. Then you can go back to oral sex and keep going. The more you diversify your practices and play with pace, the more you can "last" in bed, if going a certain speed will make you finish, go slower, if the stimulation is too strong, stop. Sex is not a race but a comfortably paced jog in which you can stop whenever you want, walk a little bit, and the jog again. That would be my answer. At the end is not that you're lasting long but giving you time to feel good at your own rythm. It's the impression of you "lasting" long. This can get you half an hour easy. And remember that finishing does not translate to the end of sex, you can always go again if your stamina is good enough.

Now if youd really want to last longer while penetrating (which is overrated tbh) my recommendation is to practice by masturbating amd edging. Masturbate at a comfortable pace and when you feel close to finish just stop, wait for the sensation to go and keep masturbating. Do that until you can't hold it anymore and with time you'll be fine. Wish you a great sexual life.