- Install ZRAM on your Linux distro
- Ublock Origin is a must. If not: https://github.com/StevenBlack/hosts. Clone it, backup /etc/hosts, append the content of the /hosts subfiles MINUS the localhost and ::1 lines.
- Use a bare window manager, not a DE. Cwm, icewm, doesn't matter. Use lxappearance to set up your gtk theme to something you like.
You'd be surprised, I've found that 1GB devices are still quite usable on the 'modern' web by adding some swap space and not having too many tabs. Of course that's approaching the lower bound of usefulness these days.