Should I creat a new account and relearn Leauge?

Well to keep this story short, I use to have an older, crappier computer which I used to play league on, but due to some technical issues, I could no longer play league on it. It's been about 10 months now and I recently got a new computer (took so long because i never really gave league a priority like other do). I have installed league again and I have played a few games already. Wasn't till now that I noticed that my skills just aren't as good as they use to be. I have actually fed badly some rounds, something I didn't use to do. My summoner level is 30 and was 30 before I stopped playing. Never got into ranked back then, and I definitely don't plan on doing it now. Should I make a new account and start fresh? I really don't want people losing games as bad as my last one due to me.