Firstly, maintain your posture - sitting erect and stop slouching
Avoid bending and lifting for few days
Avoid sitting on sofa and sitting crossed leg on floor
Break your posture every 30 mins ( sitting 30 mins get up walk around and sit back again, if standing 30 mins sit down, if walking again sit )
Change of postures is very significant
Next Steps
Do backward bends most often 3-4 times a day.
(this is a McKenzie movement for your back, incase if this increases pain then there's different movemnet for you )