well the gist of it is.
go into internet settings and delete all connections
at this point you can use 90dns
https://gbatemp.net/threads/90dns-dns-server-for-blocking-all-nintendo-servers.516234/
I'd recommend getting an rcm jig but using autorcm is fine too
You can backup your nand and boot files with hekate first.
then use choidujour to update to 6.2 and keep your fuses unburnt if you so choose (yuou can choose any firmware that isn't 7 the latest. 6.2 is the latest compatible one though)
after that you can back up your nand again on 6.2 (make sure to keep track of these files and their versions)
I'd personally use Reinx and wuld use Reinx.guide minus the nand parts
you can play switch games offline now without fear of being banned as long as you use 90dns on all of your connections. there are also workarounds for playing lan and some games online.
if you'd like to play normal online again you backup again if desired then restore your first backup via hekate.
then if you ever want to go back to cfw
either way I'd look into specifics