Britains vs Goths on Arabia

I'm looking for some advice on where I went wrong. I played a 1v1 random civ on Arabia (we were both about 1400 in Voobly RM). I got Britains, he got Goths.

Obviously I knew this would be tough. My deer were close to the berry patch, so I lured a few and decided to go scouts. I managed to harass a few vils, then when he made a bunch of spears I transitioned to archers. He managed to wall up before I did much damage, killing one vil and causing a bit of idle time.

I then decide to turtle and boom, as going archers for too long against Goths seemed like suicide. I stone walled, clicked castle and dropped 2 TCs. I kept scouting, and when I saw that he was booming instead of going aggressive, I added a fourth TC. We hit Imp about the same time, and then I drop 6 barracks in the back of my base and start massing champions. I pick up 3 relics while waiting. My thought process was that he would make huskarls to counter the expected British archers.

He starts attacking my walls with trebs, then floods in huskarls. I gleefully send in sixty or so champions, expecting them to clean up the huskarls easily. Unfortunately they kill a couple each, but there is an endless stream of huskarls that enters my base, and I'm unable to keep production up. Eventually my farmers are over-run, and I can't make any more. GG.

What could have I done differently?