Hi,
Your phone is using an old operating system (Nokia Symbian S40) that is no longer supported by Microsoft or nearly anybody else for that matter.
Research online seems to show that the last version of Opera Mini that works with S40 Operating Systems is [https://www.opera.com/mobile/download/versions|Opera Mini 4.5] (''click'' on the ''down arrow'' in the ''Choose an application search'' box and scroll down to find the link for ''Opera Mini 4.5'')
It is the same with YouTube. Here’s a download [https://www.howtofixx.com/down-you-tube/|link] (scroll down to ''Download YouTube App for Nokia Java Mobile'' that I think may be an app that lets you play YouTube videos on the phone.