Well my advice or tips would be:
1. Love your own company until you aren't looking to be married, since you only experience despair from seeing yourself as unmarried. This goes with the saying that when you don't look for things, they find you. & You never get what you expect.
2. You are more likely to have that guy come into your life if you know exactly who he is. What I mean is, what kind of guy do you want, what is his nature? If you have a certain type of guy in your head and think they are too good for you then that creates a block.
3. Have faith that he exists, and let it go, do not doubt it. God and faith work closely together, but when we look at what others have and we don't, it kind of takes us away from God.
4. Feel happy that he exists. This may seem silly, but it is the reinforcement of your faith. What is meant to be is meant to be, and with God all things are abundant.
5. Maybe do more things, be more outgoing if not already. You can't meet someone if you don't give yourself enough opportunity to. And when you see someone you would like to talk to, take that chance, face the fear and talk to them.
6. The right person appears at the right time in the right place. Find places that feel 'right' to you, not in reference to meeting someone, I mean, for you. Follow an aspiration, or something that inspires you that you have always wanted to do, or a place you've always wanted to visit. The right time comes when you do the right things for yourself, and you align yourself to God in doing that.
7. Get out of the bitter and sad feeling which causes a viscious cycle of itself. All the above will help with that if you follow it.
I hope you picked up something useful from my words of advice anyway. People would say I'm quite wise in things, and I know one thing, everything in 'our' world, is relative and we have to take responsibility for that. If something isn't 'right' in our life, then we have to look at ourselves and what we can change to find that right feeling. It's not the absence of a partner in marriage that makes you sad, it is something else and you have to find and face that. Maybe some small change is required even if it is as simple as getting over something you fear, rather than letting it be you.
Much love,
Markus