I reached for high notes for years and years.
It wasn’t until I had professional voice training that I learned the secret to landing on high notes from above.
Visualizations can help. In my studio we try a few things. Students decide what works best for themselves.
Try moving your arm and point further down the higher your notes go.
Try leaning forward as your notes go higher.
Visualize a small area on the back of your upper soft palate that you press on as you sing higher.
Visualize singing down your throat as you sing higher.
Why not give some of these ideas a try and let me know what you think. Did it help? Are you singing with less strain on your high notes? Is your tone improved?