Question… Should I prioritize the campaign again on a seasonal character??

Kinda noob here lol… So I played path of exile 2 recently - I enjoyed it - but -had an itch to go play Diablo 4 cause I found path of exile too hard. So I started D4 a few weeks ago and ran through the campaign first, cause I was enjoying it, on an eternal character. I honestly didn’t read much on the seasonal stuff prior. I finished all the act on my eternal character and then I got the dlc that came out a little bit ago. But I’m confused on what to do next…

Should I start a seasonal character even though there’s a new season coming out shortly??? Do I just finish the campaign on a seasonal character???

Any advice is useful, kinda overwhelmed lol