Congrats on doing so well! Definitely put your shop on vacation mode to catch up on your orders, and also catch your breath. You don't want to get overworked and sick. I ended up putting my shop on hold for short periods 4 different times last year, and it did not hurt me at all. In fact, I beat the previous year's sales. That is the beauty of having a shop on Etsy. It is so flexible for the seller. Just leave a note that your shop is temporarily closed with a brief reason. While it is closed, do leave a message that, even though customers' can't purchase items at the moment, you will periodically be checking and responding to all messages. That way you won't lose sales from serious customers.
You can also temporarily deactivate some of the items that take more time or are less profitable until you have time for them. Once some of my items made it to the Google SEOs, my son told me to start to focus on the items that were more profitable, raise my prices a little, and limit or delete the items that my customers didn't seem interested in. I learned to listen to my customers on what items they preferred.
Do raise your prices, and be very selective on how many and in which blogs you do giveaways. At this point, you probably don't need to do them, though it can help getting your name out there. Once customers find you, they will keep coming back and the word will spread. Don't feel guilty about turning down requests for freebies or things at a large discount. This is a business, and you need to make yourself run it like a professional business. That is hard sometimes for people, but it needs to be done to be truly successful.
Also, continue to use the teams here on Etsy for advice and support. It doesn't cost anything, and many of us have been there or somewhere similar and can give great seasoned advice. Again, congrats on your success and good luck.