Lol I had actually started downloading it again just before you posted this!! It sounds brilliant!!After completing the main game, I tried out Odyssey and then Origins, but wasn't really feeling it ... so went back to some DLC I had not yet played from Syndicate. I finished that and as if luck would have it, the Season Pass for Valhalla came right down in price (for PS4/5).
I'm now playing Wrath of the Druids, which is dramatically different to the England arc ... similar, but new things to do, new ways of doing things and brand new landscape which feels in no way recycled from the main game. It's big, too! Maybe a third of the size of the England arc by the looks of it. Bigger than the Norway arc.
If your character is even half built up, you'll be able to jump across into these DLCs and continue improving.
You know I quite fancy giving Unity another go as well. I find that French Revolution setting just irresistible!! It got slated a bit when it came out but I think (hope!!) all the bugs will be patched out by now!!