Actually, I was the strongest? Immediately after the incarnation, the bottom starts, but you are rising your reverse life with all-around magic!

I, a HIKKI-NEET, suddenly reincarnated in another world as a prince, and was immediately deemed the weakest ever, with my life already in a pinch after being abandoned as a baby, being stared down by a huge beast!? However, I could only use one kind of magic. It was close, but I was able to avoid a “dead end” in my first few days of being born using that magic. Anyways, I just want to live a lazy shut-in life as an adopted noble with my one all-purpose magic, but…?