Rekindle a masters flame

hi guys, I'm looking to reignite my old chess abilities and was wondering how to do so.. My apologies to those who feel offended if I called myself a master but, in the I was really good, my highest rating was 1978 which was 2 years ago and that's when I had just discovered & started studying opening theory and building a repertoire for my ever changing style : *positional mostly against stronger opponents, ( it came naturally) *tactical against weaker *spread evenly against opponents roughly equal to me * I use to play any opening and grasp the concept before reading theory , I suspect cause of the deep positional mind I had * able to find the right move instantly but, know I know the right but I lack execution Do please please please, hear my cry for help also give motivation and what inspires you to play, ebooks (free download are preferred but any thing is fine). step by step guides to getting back in top / improvement guides. any thing could be helpful right I'm still young (19yrs) strength from 1900s to 1400s... that's bad plz plz plz help thank you