How do I find a partner for marriage rather than casual dating?

State your intention in your profile and conversations, spend time with people who share it and set a reasonable timeline for getting to know each other. Involve family or friends when you are ready. Be patient and respectful.

Prefer platforms or events that focus on serious relationships. Ask about marriage views early and be honest about yours.

Say it simply and give them space: "I have started to feel more than friendship for you. You do not need to answer now, and I value our friendship either way." Then really give room. If they feel the same, great. If not, a little distance can help the friendship recover.