The invitation with a time on it

You exchange another message saying it has been too long. Both of you mean it. Nothing happens because neither message gives the other person a next step.

“Would you like a twenty-minute walk on Thursday after work?” gives your friend a time, an activity and a sense of how much room it needs. Keep the plan suited to the person you are inviting.

Add “If that does not work, another day is fine.” An invitation can be specific without becoming a test of affection. Their calendar contains things you may not know about.

One unanswered invitation is incomplete information. A long pattern may tell you the friendship needs a different shape. You can offer a door without standing beside it indefinitely.

You do not need a whole free weekend to catch up. A brief conversation can be the plan itself, rather than an apology for not arranging something more impressive.