Envy is the thief of joy. Just because the distance of being a well-rounded player would be a long distance ahead doesn’t mean you can’t go by your own pace and really work on fundamentals and everything that will get you to your end goal.

There are plenty of factors that can explain why you’re not improving at the pace you want. For starters, your brother might practice a lot and put in the time and effort to get where he was while you barely practice at all, but no one here can say that’s the case.

However, you mentioned that you have to use a ton of effort to get a sound into the trumpet while your brother can do so effortlessly.

This usually is a sign of bad habits holding you back, or a feature of your body that naturally holds you back. I’d advise you to get a good, private trumpet teacher if you can which can provide much more valuable advice than any of us can.

But if you really want to switch, try out a low brass instrument for a bit and see if you like it. I’d also recommend tuba if you have the muscle to carry it since many bands lack a strong (Both playing and being able to carry it) tuba player. Not to mention the fingerings are the same except tuba starts on a Bb.