How can I deal with excess seeds?

Solution 1:

Seeds cannot be compacted down in any way like wheat or ores are able to.

If you really need to store that many seeds, a single chest only takes two wood logs to craft; they are relatively inexpensive, so as long as you have the physical space, you can fit a very large amount of seeds into as many double chests as you need.

If space is an issue, there are also designs which allow you to pack a massive amount of storage into a small area:

Solution 2:

You can make a composter using eight wooden half slabs. Put the seeds in the composter and it will give you bone meal. You can also start another farm for extra seeds and extra bonemeal :)

Solution 3:

If you wanted to use them up, you could feed baby chickens to make them grow faster and then kill them for some chicken. About 1 full stack of seeds can make a chicken grow in about 15 seconds from the start of feeding it to when the chicken is fully grown

Solution 4:

With recent development, I would recommend now that they be composted into bone meal.