The best way forward is certainly not obvious. Here's a suggestion for how we might proceed:
Move S7 onto the tundra hill as Folket advocates, then look at the water tile 2SE of that hill
If it is coastal tile, then (unless some new and valuable resource(s) is also revealed from the hill) it is unlikely that there is abundant land and multiple good city sites well to the east, so the probable distance-maintenance advantage of settling S6 in place is significantly lower. So we settle S1 as the capital (and probably move S6 to help explore, as settling the S6 site before we can build a monument is not particularly helpful).
If, on the other hand, the tile is fresh water, then there is likely much more land and good city sites to the east, and the distance-maintenance advantage of settling S6 as our capital will probably be significant. So, we settle S6 as the capital (though we could first move S1 onto the fir hill just to make sure there aren't two very good city sites to share the furs)