Downgrade to ios 18.5 from ios26 without losing esim?

Should have been Downgrade!

I downloaded ios26 beta on my iPhone 15 and trust me, I made the worst decision of my entire existence. The battery doesn’t even last for 5-6 hours. It keeps draining .. the system is laggy and everything. I want to downgrade but I have my esim.. now I don’t want to visit store to regain my sim card, any idea how I can fix this and downgrade my phone without losing my esim?