We're from the US, and have lived in Thailand for almost 9 years now! I would recommend leaving/giving away/selling it all. We only brought 3 backpacks, and have not regretted it for one minute.
Everyone we know who has attempted to bring their stuff ended up with so many headaches! A large percentage of rental homes here are already furnished, and it's way more trouble to ask the landlord to remove it than it's worth. Plus, if you decide to move .... another headache.
Everything is cheap here. You can buy what you need.
As for keepsakes, we left them with my daughter in the states. We also scanned many of the photos and have them in online storage for the whole family to enjoy whenever they want.
Krungsri (yellow bank) was the easiest for us. BUT ... do not open a join account because they really don't understand that. Also, we were told that if we had a joint account, we could NOT get internet/phone app access.
Go to a high tourist area in a mall or similar. It will not happen in small towns in Thailand. Best of luck!