Maybe it danced from that position. Also, you could be searching from a different location. Lastly, the position in GSC is the average. To see exactly where your site ranks, use a rank tracker.
Which one do you suggest??
In what country are you trying to rank? If you're trying to rank in the US, use a US VPN to access Google, search for your keyword, and find out where your website really ranks. Then focus on improving your rankings through quality content and links.
Yes i've tried it but the problem is that the website doesn't show up at all now for that keyword.
It could be dancing or penalized. Have you built any new links recently?