Thank you @tessaragabrielle for your insight!
I know it sounds overwhelming but, in fact, it is not. I don't have that many relationships that I want to actually revive. There were some toxic and uninterested people in my chat inbox that I am fine with letting go. Also, I am not planning to text those that I want all at once. I am spreading it over several days to avoid being overwhelmed, as you put it :)
Thank you for your thoughtful advice to not judge myself. I am highly skilled in that area, so it is always nice to get more encouragement from others. You are absolutely right, it is important to have personal space and my closest friends are on the same page as me in that aspect. I always try to avoid responding generically in two-words because I want to support my friends, not just stay in touch.
Thanks for your comment, always lovely to meet another introvert and share opinions. Hope your methods work for you as well :-)