Build ideas, adapt or start over

Played the crpg however long ago didnt finish it bc I got distracted by something else recently returned to it with all of the dlc and thought id try something im not really used to. Damphir witch chaotic evil merging to an eldritch knight...

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just got my first level in EK, felt like me and my party were doing pretty ok until shortly after the over world map exploration started and now it seems like every fight is a slog none of us are doing any damage everything is bodying us and my main PC is basically downed in one maybe two hits by almost everything. Went with necromancy spells for the damphir blood witch type idea.... idk should I have built differently or is this a pretty common hiccup and a couple more levels in things will balance out? Should I put more points in fighter? Is witch the worst possible choice I could have made here?

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Im not really trying to get too into the weeds and watching 16 hours of build reviews just to start the gane over for a perfect build or anything just a push in the right direction before I get to far gone and screwed? Maybe just specific types of fighter or witch directions I should respec to or something? Im not super hung up on the immersion of sticking exactly to my character it just seemed like a cool idea that might lean into a late game build and now im not so sure that its even viable