My bathroom sink has been draining slower by the day, and plumbers are fully booked until after Christmas. What can I try first?

to suck out the clog from the drain.
This technique can be surprisingly effective for removing stubborn clogs that are beyond the reach of a drain snake or zip tie, especially if the clog is composed of small, loose particles.
7. Plunge The Sink Properly Without Splashing Disaster
A plunger can be a powerful tool for unclogging a sink, but it’s crucial to use it correctly to avoid making a mess. First, ensure the sink has enough water to cover the plunger’s suction cup. Then, block any overflow openings with a wet cloth to create a seal.
Position the plunger over the drain and give it several firm, quick plunges. The pressure created can often dislodge stubborn clogs. Once finished, run water to check if the drainage has improved. Repeat as necessary.
8. Clean The P-Trap (The Smelly But Effective DIY Step)
If none of the above methods work, it