Well you may also be interested then in another book called the Carmina Gadelica By Alexander Carmichael. I considered it when I wanted to learn about folklore, but it seems to be more focused on Celtic Christianity, whereas I was looking for more about the very old ways and folklore. The Silver Bough was good for that though. It does sound like it'll fit your interest! :)
Is a good general source.
I also highly recommend purchasing:
https://www.amazon.com/Carmina-Gadelica-Incantations-Alexander-Carmichael/dp/0863155200
It's a great resource that you will turn back to a lot. On the surface level, there are a lot of things that can easily be "paganized". On a deeper level, it records folk practices that give hints to older practices.
Offering to the Gods, ancestors and spirits is a very good way to build that sense of connection. Simple offerings of oats, cream, butter, and honey are a good start. If you are poetically inclined, you could compose poetry to accompany your offerings, otherwise a simple prayer will suffice.
Since your leaning into your ancestry, you could say something like:
"Hail to the Gods my ancestors swore by, With a grateful heart I leave these offerings for you. Remember us who remember you".
Good luck on your journey!