What options do Indian passport holders have for visa extension or changing their visa status while in Thailand?

An Indian passport holder currently in Thailand on an arrival visa is seeking advice on extending their stay or obtaining a sticker visa for 6-12 months without returning to India. However, responses indicate that the best option is to return to India for a proper visa application as other nearby countries do not provide long-term visa solutions for Indian passport holders. The consensus is that a visa is generally not obtainable from neighboring countries like Laos or Vietnam.