A few questions about writing fics after a long hiatus

It's been about a year since I last wrote anything. I think it was like...a crappy Wincest fanfic for Valentine's Day lol. After that I couldn't get the words out anymore. Writing was hard. So now I want to start writing again since it's getting close to summer vacation, and I should have time to get back into writing, and doing it well. I've got inspiration for a few fics, so what should I do to prep myself back up for it? How do I develop a new writing style? Because honestly, it feels like it was so shitty before that I recently went and orphaned all of my AO3 fics after cringing for 45 minutes XD Finally, how do I keep my writing on track, and how do I keep myself in a state of mind where I won't get bored or abandon a fic before I've even typed a single word?