This can be a very difficult task, especially from one raised in Western society. Western society is very busy, long hours at work, driving hard to achieve one's goals, and so many distractions with gadgets, social media, and advertising. All these things interfere with our spiritual growth and our communion with God.
The first step in solitude is to first pray. Pray that God remove the distractions from you and reveal Himself to you and give thanks for His sacrifice, salvation, love, and sustaining power. God will guard you from evil, if you only trust in Him.
The quiet solitude is something that must be practiced. It doesn't come all at once. After all, you've had 25 years of practice the old way

Try to clear your mind, and if a thought enters your head, you can refocus by reminding yourself that nothing is so urgent right now that it can't wait until your period of quiet solitude is done - which is absolutely true. You might try withdrawing to a quiet place, like a walk-in closet or a park.
Try to relax. Often we are a lot more tense than we realize. Begin with intensionally relaxing your facial muscles, then your body and limbs.
Be patient, and don't worry. God loves you and seeks to unite you with Him.