For a start...Actually take some time on the songs, write about how you feel and things that matter to you instead of just saying 'that rhymes with that, fuck it that'll do' Then hire a great producer like Dave Sitek and actually listen to his ideas, let him help with the arrangements and flesh the songs out, hell, give him co-writing credits if need be.

Then stop trying to be John Lennon and realise people fell in love with the tone of your voice, not the sunsheeeiiiiiine quirk, stop putting it on or trying to impersonate your younger self, just sing, as best as you possibly fucking can! Sing from your diaphragm, you may not be able to hit the high notes but that'll bring the power and tone we all love, even if it's deep and monotone. Invite other artists (Like Squire or Marr if you're being cautious) to write some solo's or add some depth to your tracks. Move to a more modern (in an alternative way) sound, stop living in the 60's because even your most madferit fans are bored shitless with that now, embrace a more sonically diverse sound!

Above all else, put the acoustic guitar down, record yourself singing some melodies, based on lyrics that actually matter to you and build the songs around that. That will give your tracks so much more room to grow and will suit your range, coupled with my earlier advise should produce a great record!