First off. Ponder on your positive behaviors, as well as negative. Hopefully, the positive will out weigh the negavite. If not. Clean emotinal house.
Take a "realistic" veiw of who you are, and who may be a "realistic" equal.
Think of hobbies, passions, goals, etc. and attend events or classes where you can meet singles that share your likes. But remember your realistic mirror.
Put your big boy pants on, and when you see someone you think may be of interest, ask them for their number. Meet in a populated place.
Always be a gentle men. From the heart.
If you're douche bag, in anyway, don't be selfish. Let the nice ones go (as not to hurt or scar them)
Be aware of how one problem solves. Very important.
Don't be desprate. That will scare many away. But at the same time don't be too cool.
Notice how one interacts with family or and friends.
It's a numbers game. If you make the effort to go out and mingle. Eventually, you'll meet someone.
Don't waste time on someone who isn't into you. Lick your wounds. Move on swiftly. There really is pleanty of fish in the sea.
What I find awesome are seniors who meet and marry. So there is hope what ever stage you're in.