This is indeed very basic and standard, I suggest you just switch to Xtreme, select a sub-theme that is the closest to what you have now, and start tweaking from there.
If you run into problems, come back here with detail questions.
And remember you can always switch back to Weaver II when not working on it, and until you get it right
And take a chance to revisit the styling based on more modern concept like Full with as explained in the guide article below
https://guide.weavertheme.com/full-width-design/