I'll miss Arc but got fed up about 4 months ago and switched to Safari with a combination of SupaSidebar[1] for the spaces/vertical tabs and OpenIn [2] for Air Traffic Control. I'm pretty happy with it!

1 - https://supasidebar.com 2 - https://loshadki.app/openin4/

I tried supasidebar for like a week, then used helium for month. In the past month I've settled on search with vimium: https://officecommun.com/search