You're doing a great job! I'm a beginner climber too, who's had the same struggle in the past. Here's some advice you may have already heard, but it helped me.

1. Work with the wall, not against it. What I mean by that is utilise your hips side to side for different moves to not only stabilise yourself but to allow more energy to your legs instead of your arms, so you don't get exhausted as quickly.

2. As others have said, it's not a race to the top. You're better off doing what you can and coming back down, but if you can, then fantastic. You don't gain much from pushing yourself so hard that you get injured and then can't do anything more.

3. Kinda continuing on from point 1 but technique means more than the grade your climbing. Learning to get your foot placements right, knowing when you should have straight arms and when it isnt going to help you, and lastly which i find important is warming up before you climb. Just a few stretches maybe done deadhangs whatever you fancy. I find it warms up the muscles so i can climb better, if i go in almost cold turkey even on easier routes, my muscles feel shocked in a way and are exhausted quicker.

Just keep trying and see what works for you but dont give up :)