For tourist visa you have to apply outside Thailand at an Thai embassy or consulate. You need much paperwork and have to stay 2-5 days.
So better extend it now at immigration in Thailand for 1.900 B. Before this extension expires, take an agency (3-5.000 B ) and make border run to get new 30 days stamp (1 day trip). This you can extend again 1 time with 30 days. In total 135 days
Lucky boy. Looks like if u stay some days/weeks outside Thailand and not long in country, it is ok for immigration. You can try until they say something or apply for multiple entry tourist visa which is 6 month valid. Or start Elite visa process if u want get save.
Depends on airline. Some want see a ticket out of Thailand , some not. Generally you can go to immigration in Thailand and extend your stay for further 30 days, means in total 60. costs 1.900 B. But this doesn’t solve the airline problem. If you really want to go to Laos, book tickets in advance to show at check-in. Than you will get new 30 days stamp at Re-entry Thailand. Overland entry is limited to 2 per calendar year. Air is not.