I’m an Android user for various reasons, but, repair alot of phones, tablets. You could try an hard reset yourself to see if that fizes it but, its more common the button is faulty. Most phone repair shops will fix this for around £40 or around £75 with a new battery. If your near me (SA) I’d do it for you for the price of the parts.
Its worth remembering your Iphone is better than the Iphone SE 2020. There’s also a newer 2022 model of SE.
You may pick up something in the New year sales 🙂